Shop your veterinarian's online pharmacy for pet medications, preventatives, and prescription food. Enjoy home delivery, AutoShip, and savings.

Online Veterinary Pharmacy: Home Delivery & Savings

Keep your dog or cat safe this Halloween with tips for managing anxiety, preventing escapes, avoiding toxic treats, and reducing holiday hazards.

Halloween Safety for Pets: 5 Tips for Dogs and Cats

Learn why preventive veterinary care is important for your pet's long-term health and how wellness bundles can help make routine care more affordable.

Animal Doctors Pet Wellness Bundles: Affordable Preventive Care for Dogs and Cats

Learn how to recognize signs your pet may be overweight and discover simple ways to support a healthy weight through nutrition, activity, and veterinary care.

Pet Obesity Awareness Month: Healthy Weight Tips

Prepare your pet for the unexpected this National Preparedness Month with tips for emergency kits, evacuation plans, identification, medications, and more.

National Preparedness Month: How to Prepare Your Pet for an Emergency

Wed Apr 02 2025 00:00:02 GMT+0530 (India Standard Time)

Animal Doctors

about-us-page

our-history-section

our-teams-section

We are dedicated to providing the highest level of care along with friendly, compassionate service.

why-us-section

app-download-page

blogs-page

blogs-section

book-appointment-page

book-appointment-section

Embedded content

care-memberships

care-plan

career-page

careers-section

Dr. Roy Madigan, D.V.M., is not just a veterinarian. He is one of the leading experts in canine Chagas disease in the United States.
<br><br>
• Founder of Vida Pharmacal, focused on breakthrough parasitic disease treatments
<br>• Filed the first veterinary drug patent for anti-T. cruzi activity in dogs
<br>• Principal scientist for the U.S. military working dog Chagas treatment study
<br>• Veterinary lead for the Texas Chagas Task Force alongside the CDC and UT Health
<br>• Pioneer in developing diagnostic and treatment protocols for infected dogs
<br><br>
Your pet is being treated by the same expert helping shape how Chagas disease is understood nationwide.

Get In Touch

Chagas disease progresses in stages. The earlier it is identified:
<br><br>
<br>• The more treatment options are available
<br>• The better heart damage can be managed
<br>• The higher the chance of improving quality of life
<br><br>
Waiting can mean irreversible cardiac damage.

<b>Early Detection. Advanced Treatment. Led by One of the Nation’s Top Experts.</b>

<b>Do not wait for symptoms to appear.</b>

Chagas disease is often silent early on, but warning signs may include:
<br>
<br>• Lethargy or decreased activity
<br>• Fainting or collapse
<br>• Irregular heartbeat
<br>• Difficulty breathing
<br>• Unexplained weight loss
<br><br>
If your dog spends time outdoors, lives in Central Texas, or has been exposed to insects, they may be at risk even without symptoms.

If your dog may have been exposed to kissing bugs, do not wait. Chagas disease can silently damage the heart before symptoms appear. Early diagnosis can make the difference.

At Central Texas Vet, we go beyond standard testing.
Dr. Madigan is actively developing advanced serologic testing methods to improve detection accuracy.
<br><br>
Your dog’s evaluation may include:
<br>
<br>• Comprehensive physical exam
<br>• Cardiac screening
<br>• Specialized blood testing for T. cruzi
<br>• Advanced diagnostics when needed
<br><br>
Early detection allows for better management and improved outcomes.

Chagas disease is caused by the parasite Trypanosoma cruzi, transmitted by “kissing bugs” commonly found in Texas.
Once infected, dogs may appear normal while the parasite attacks the heart and other organs.
<br><br>
Without intervention, Chagas can lead to:
<br>
<br>• Heart disease
<br>• Arrhythmias
<br>• Sudden death

Questions? We Have Answers

If your dog may be at risk, schedule an evaluation today and get answers from one of the leading experts in the field.

chagas-disease

<p dir="auto">At The Animal Hospital of Smithson Valley, we go beyond standard testing.</p><p dir="auto">Dr. Madigan is actively developing advanced serologic testing methods to improve detection accuracy.</p><p dir="auto">Your dog’s evaluation may include:</p><ul><li><p dir="auto">Comprehensive physical exam</p></li><li><p dir="auto">Cardiac screening</p></li><li><p dir="auto">Specialized blood testing for T. cruzi</p></li><li><p dir="auto">Advanced diagnostics when needed</p></li></ul><p dir="auto">Early detection allows for better management and improved outcomes.</p>

<p dir="auto">Dr. Roy Madigan, D.V.M., is not just a veterinarian. He is one of the leading experts in canine Chagas disease in the United States.</p><ul><li><p dir="auto">Founder of Vida Pharmacal, focused on breakthrough parasitic disease treatments</p></li><li><p dir="auto">Filed the first veterinary drug patent for anti-T. cruzi activity in dogs</p></li><li><p dir="auto">Principal scientist for the U.S. military working dog Chagas treatment study</p></li><li><p dir="auto">Veterinary lead for the Texas Chagas Task Force alongside the CDC and UT Health</p></li><li><p dir="auto">Pioneer in developing diagnostic and treatment protocols for infected dogs</p></li></ul><p dir="auto">Your pet is being treated by the same expert helping shape how Chagas disease is understood nationwide.</p>

<p dir="auto">Chagas disease is caused by the parasite Trypanosoma cruzi, transmitted by “kissing bugs” commonly found in Texas.</p><p dir="auto">Once infected, dogs may appear normal while the parasite attacks the heart and other organs.</p><p dir="auto">Without intervention, Chagas can lead to:</p><ul><li><p dir="auto">Sudden death</p></li><li><p dir="auto">Heart disease</p></li><li><p dir="auto">Arrhythmias</p></li></ul><p dir="auto"></p>

<p dir="auto">Chagas disease progresses in stages. The earlier it is identified:</p><ul><li><p dir="auto">The more treatment options are available</p></li><li><p dir="auto">The better heart damage can be managed</p></li><li><p dir="auto">The higher the chance of improving quality of life</p></li></ul><p dir="auto">Waiting can mean irreversible cardiac damage.</p>

<p dir="auto">Chagas disease is often silent early on, but warning signs may include:</p><ul><li><p dir="auto">Lethargy or decreased activity</p></li><li><p dir="auto">Fainting or collapse</p></li><li><p dir="auto">Irregular heartbeat</p></li><li><p dir="auto">Difficulty breathing</p></li><li><p dir="auto">Unexplained weight loss</p></li></ul><p dir="auto">If your dog spends time outdoors, lives in Central Texas, or has been exposed to insects, they may be at risk even without symptoms.</p>

chagas-disease-ahsv

Chagas disease progresses in stages. The earlier it is identified:
<br><br>
<br>• The more treatment options are available
<br>• The better heart damage can be managed
<br>• The higher the chance of improving quality of&nbsp; life
<br><br>
Waiting can mean irreversible cardiac damage.<div><br></div><div><br></div><div><br></div><div><br></div>

Chagas disease is often silent early on, but warning signs may include:
<br>
<br>• Lethargy or decreased activity
<br>• Fainting or collapse
<br>• Irregular heartbeat
<br>• Difficulty breathing
<br>• Unexplained weight loss
<br><br>
If your dog spends time outdoors, lives in Central Texas, or has been exposed to insects, they may be at risk even without symptoms.<div><br></div><div><br></div>

chagas-disease-ctv

contact-us

copy-of-chagas-disease

Accordion Title

#1f2937

forms-page

form-section

get-in-touch

landing-page

contact-us-section

cta-bar

emergency-branches

faq-section

footer-section

hero-section

otto-widget-section

our-services-section

testimonials-section

vetstoria-widget-section

Financial Aid:

Obedience:

Local Dog Parks:

Boarding Kennels In Our Area:

Microchipping:

Doggie Daycare in our Area:

Adoptions:

General Information:

links-and-resources

news-page

our-history-page

Our <b>East Side Entrance</b> is located on Early Street, across from the Hanover Apartment Building. Our <b>North Side Entrance</b> is located on Irby Avenue, across from Woody’s Cheesesteak.

parking

payment-info-page

payment-information-section

payment-section-3

promotions

services-page

service-page-section

team-page

teams-page-section

video-page

pixel_google

pixel_facebook

Header Cookie Consent - 671f33c5d8e9f7c6b5f082c9

cookie_settings_1750955345987

<button id="ot-sdk-btn" class="ot-sdk-show-settings">Cookie Settings</button>
 

cookie_list_1750955346272

cookie_microsoft

<p dir="auto">Purring is the most common sound a cat makes and what owners are used to. Yet we know less about the unique sound than meowing, hissing, and growling. Many cat owners are taught that cat purrs are to show that the cat is happy, although a cat’s meow has more meanings.</p><p dir="auto" style="text-align: left">While purring is partly instinctive and voluntary for cats, cats can use the purr sound for various reasons, such as using the soft rumble to communicate as a form of healing or self-soothing. This is why cats will purr whenever they are in pain, injured, or are in a stressful situation.</p><p dir="auto" style="text-align: left">Here is what you need to know about cat purring. This article will inform you how they purr, how you can tell what your cat’s purring means, why they do it, and other facts about cats’ purr.</p><h2 dir="auto" style="text-align: left; line-height: 1.1"><strong>When&nbsp;Do&nbsp;Cats&nbsp;Start&nbsp;Purring?</strong></h2><p dir="auto" style="text-align: left">Cats begin to purr after a few days of being born. Kittens are born blind until two weeks old. When they are blind, they use purring to communicate with their mother to alert them on where they are, and to draw their attention when they are getting hungry or when it’s feeding time. Cats carry this behavior till adulthood and will be familiar to cat parents whenever it’s time for dinner. These are just a few of the ways purrs are used by cats.</p><h2 dir="auto" style="text-align: left; line-height: 1.1"><strong>How&nbsp;Do&nbsp;Cats&nbsp;Purr?</strong></h2><p dir="auto" style="text-align: left">When a cat purrs, nerve signals are sent to the muscles of the voice box and diaphragm, which helps expand the chest once breathing. These nerve signals stimulate the vocal cords, so when a  cat takes in air and exhales, the air in the diaphragm moves across these muscles, resulting in the purring sound of both domestic and wild cats.</p><p dir="auto" style="text-align: left">Purring has developed throughout the years to help keep cats’ bones and muscles intact at all times. This is extremely useful during long periods of inactivity, like the hunting style, when they have to wait a while before they pounce on prey and ambush it. The cat's purr is almost a continuous sound. A cat’s purr is when they both inhale and exhale.</p><p dir="auto" style="text-align: left">Scientist used to believe that cat purring would usually come from the vibration of their hearts, and if you felt your cat purring, you would know why they used that theory. Air vibrates whenever the cat inhales and exhales at approximately 25 to 150 vibrations per second.</p><h2 dir="auto" style="text-align: left; line-height: 1.1"><strong>Why&nbsp;Do&nbsp;Cats&nbsp;Purr?</strong></h2><p dir="auto" style="text-align: left">Cats purr for different situations, which causes multiple theories on the sound they make. Here are different reasons cats purr.</p><h3 dir="auto" style="text-align: left; line-height: 1.1"><strong>Your&nbsp;Cat&nbsp;Is&nbsp;Happy</strong></h3><p dir="auto" style="text-align: left">&nbsp;</p><p dir="auto" style="text-align: left">Cat’s owners are used to hearing their cat purr whenever their cat is content and happy. It’s like how a dog wiggles its tail and jumps, all excited.</p><p dir="auto" style="text-align: left">Your cat is sitting on your lap and getting pets and scratches. They are probably purring to inform you they love what they are receiving, a nonverbal way to communicate with their owners without using words, but sounds. If your cat is receiving love and it purrs, you don’t need to worry; just keep showing your cat love.</p><p dir="auto" style="text-align: left">Humans laugh and dogs wag their tails when happy, cats produce a low rasping vibration sound that is often heard when they’re being pet or scratched. Cats can purr to other cats or even other pets like dogs.</p><p dir="auto" style="text-align: left">&nbsp;</p><h3 dir="auto" style="text-align: left; line-height: 1.1"><strong>Your&nbsp;Cat&nbsp;Wants&nbsp;Food&nbsp;or&nbsp; Something Else</strong></h3><p dir="auto" style="text-align: left">&nbsp;</p><p dir="auto" style="text-align: left">Sometimes cats purr whenever they are hungry or want something. Researchers have differentiated the purrs of content versus hunger. The purr sounds like their pleasant purr and a whining purr, like a child whining or crying. Cat owners are more likely to respond to the sound.</p><h3 dir="auto" style="text-align: left; line-height: 1.1"><strong>For&nbsp;Healing&nbsp;Mechanism</strong></h3><p dir="auto" style="text-align: left">&nbsp;</p><p dir="auto" style="text-align: left">Although purring takes so much energy, cats use this sound as a form of self-meditation or relief from pain and recovery whenever they are hurt. It’s simply a way for cats to soothe themselves, similar to a child that sucks their thumb to feel better or a man humming or talking to himself.</p><p dir="auto" style="text-align: left">According to studies, purring is done at a low frequency that helps to stimulate the injured area to make it feel better, including most of the tendons and bones. The frequencies of the purrs cause vibrations within their body, which can:</p><ul><li><p dir="auto"><strong>Reduce pain and swelling</strong></p></li><li><p dir="auto"><strong>Ease breathing</strong></p></li><li><p dir="auto"><strong>Repair tissues, tendons and build muscles.</strong></p></li><li><p dir="auto"><strong>Heal bones and wounds.</strong></p></li></ul><p dir="auto" style="text-align: left">This might explain how cats are able to survive falls and the theory of cats having nine lives. They also tend to have less complications after a surgery than other pets.</p>

Purring is the most common sound cats make and what owners are used to. Yet we know less about the unique sound than meowing, hissing, and growling. Many cat owners are taught that cat purrs are to show that the cat is happy, although a cat's meow has more meanings.



Why Do Cats Purr?

gtm_67ec30aadd3917d9289b57d4

Join our veterinary team at Animal Doctors!

animaldoctors

Thank you for considering our hospital as your pets provider of veterinary services. We are dedicated to maintaining the health of your pet and look forward to many future years together.

Compassionate and quality care for your pets.

Served over 10,000 fur babies and their happy families.

<p>To help us provide the best care possible, payment is required at the time of service. We accept cash and all major credit cards, and we are happy to offer a no-interest payment plan through CareCredit.</p>

CareCredit

Trupanion Pet Insurance

ScratchPay

Mr. Dog Training

Tree Frog Farm Personalized – Dog Training and Agility

Brunswick Maine Dog Park

Great Island Kennel

Pet Sitters of Maine

The Brown Dog Inn

Camp Bow Wow

Falmouth Happy Cats

Home Again

The Blue Dog Daycare

Happy Paws Unleashed

Midcoast Humane

Passion for Pets Rescue Organization

Coastal Maine Great Dane Rescue

VeterinaryPartner.com

The Indoor Pet Initiative

Feline Fix by Five

Traveling Out of the Country with Your Pet

AAHA Pet Health Library

Pet Poison Control

Free Exam for New Clients! See Below for Details.

Consult Online

Online Store

Pet Portal

Forms

Download App

Below are some answers to our most common questions.

Additional Services

General Services

Speciality Services

Laser therapy is a non-invasive treatment that uses light to stimulate healing and reduce pain in animals.

Laser Therapy

Saying goodbye is the hardest part of loving a pet. When that time comes, you deserve clarity, comfort, and the space to make decisions with peace of mind.

End-of-Life Support

When your pet needs medication, trust and convenience matter. At (), we prescribe and dispense medications directly from the team whos seen your pet, knows their health history, and understands their specific needs.
No guessing, no delays, and no unnecessary confusion.


Pet Prescriptions

Skin issues are one of the most common reasons pets end up at the vet, and they're also some of the most frustrating. Allergies, infections, or even food sensitivities can all cause your pet discomfort.

Dermatology & Allergy Care

Nutrition is the foundation of good health, and a powerful tool in managing weight, energy, chronic conditions, and even behavior.

Pet Nutrition

Your pet can't tell you when something's wrong. That's why regular wellness exams are so important. These visits give us the chance to catch health issues early, before they become painful or costly.  

Wellness Exams

Bad breath isn't just annoying - it's often a sign of deeper health issues. Dental disease in pets can lead to oral pain, local or systemic infection, tooth loss, and even heart, liver, or kidney complications. 

Dental Care

Fleas, ticks, and intestinal worms are not just a nuisance, they are dangerous. These tiny pests can cause serious health issues like Lyme disease, heartworm disease, and tapeworms. 

Parasite Prevention

Vaccines are one of the most important tools we have to protect pets from serious, often deadly diseases. Whether you have a rambunctious or a relaxed pet, vaccinations help your pet build strong immunity and avoid preventable illness.

Vaccinations

Comprehensive surgical services, from routine procedures to complex operations, all are performed with expert care.

Pet Surgeries

When your pet isn't acting like themselves, diagnostic testing helps us find the reason. From bloodwork, urine testing, and fecal exams to x-rays, these tests give us a window into what's happening inside, so we can take action before things get worse.

Diagnostic Testing

When pets get sick or injured, you want answers fast. Advanced imaging gives us a deeper look, without invasive procedures.


Advanced Diagnostic Imaging

Permanent ID for Peace of Mind. A collar can come off. A tag can get lost. But a microchip is a permanent, tamper-proof way to make sure your pet always has a way home. At (), we offer safe and simple microchip implantation, so your pet stays connected to you, no matter what.

Pet Microchipping

Discover hidden dental issues before they cause pain with pet dental radiology at (). Our veterinary dental X-rays reveal infections, bone loss, and tooth damage beneath the gum line, ensuring safer, more effective treatment. Non-invasive and included in every comprehensive dental cleaning, dental radiographs for pets help protect your pet's health, comfort, and smile for years to come.


Dental Radiology

Spaying or neutering your pet is one of the most important decisions you can make for their long-term health. It helps prevent certain cancers and infections, curbs unwanted behaviors, and reduces the number of orphaned pets in shelters.

Sheet title

Why Do Cats Purr?

Recent Blogs

Related Blogs

Caring for Senior Cats: What Changes With Age?

How to Help Your Pet Stay Calm This Halloween

Why is My Dog Limping?

Frequently Asked Questions

Sheet title

Why Do Cats Purr?

Recent Blogs

Online Veterinary Pharmacy: Home Delivery & Savings

Halloween Safety for Pets: 5 Tips for Dogs and Cats

Animal Doctors Pet Wellness Bundles: Affordable Preventive Care for Dogs and Cats

Related Blogs

Caring for Senior Cats: What Changes With Age?

How to Help Your Pet Stay Calm This Halloween

Why is My Dog Limping?

Frequently Asked Questions

Do you offer discounts for new pet owners visiting your hospital?

Can I schedule a same-day veterinary appointment for my pet?

Do you have another location nearby?

What are Animal Doctors' hours?

Do new clients get a discount on their first visit?

Do you offer discounted wellness packages for preventive care?