Veterinary Internal Medicine for Dogs & Cats
When your pet has ongoing symptoms or a complex medical condition, our Internal Medicine specialists are here to help. Using advanced diagnostics and personalized treatment plans, we work to find answers, manage chronic disease, and improve your pet’s quality of life.
Telehealth follow-up available with Dr. Fryer!
When scheduling online, choose Mesa and select Telehealth for *Appointment type.
Now Seeing Patients
5 Days a Week
Our Internal Medicine team is available five days a week to provie advanced care when your pet needs it most.
CT Imaging Available 7 Days a Week
Advanced CT imaging is available seven days a week to help diagnose complex conditions quickly and accurately.
Convenient Telehealth Follow-Up Appointments
Dr. Fryer often sees follow-up cases by telehealth, providing a low-stress, easy alternative for ongoing care.
Easy Online Referrals
Our simple referral form makes it easy for your veterinarian to refer your pet and provide the advanced care they deserve.
Now Seeing Patients
5 Days a Week
Our Internal Medicine team is available five days a week to provie advanced care when your pet needs it most.
CT Imaging Available 7 Days a Week
Advanced CT imaging is available seven days a week to help diagnose complex conditions quickly and accurately.
Convenient Telehealth Follow-Up Appointments
Dr. Fryer often sees follow-up cases by telehealth, providing a low-stress, easy alternative for ongoing care.
Easy Online Referrals
Our simple referral form makes it easy for your veterinarian to refer your pet and provide the advanced care they deserve.
Dr. Kreissler
Areas of Expertise
- DACVIM (SA)
- Advanced Diagnostic Procedures
- Endoscopy
- Ultrasound
- CT
- Chronic enteropathies
- Nephrology/Urology
- Hepatic Diseases
- Complex Respiratory Diseases
Dr. Maeckelbergh
Areas of Expertise
- DACVIM (SA)
- Advanced Diagnostic Procedures
- Ultrasound
- CT
- Endoscopy
- Feline Internal Medicine
- Nephrology
- Endocrinology
- Hematology
Dr. Fryer
Areas of Expertise
- Residency trained in SAIM
- Abdominal Ultrasound evaluation
- Geriatric Medicine
- Long term medical case management
- Endocrine disorders
- Chronic renal disease
- Telemedicine
- Second opinion or unresolved internal medicine concerns
- Therapeutic Nutritional Coach
Can an Internal Medicine Specialist Help My Pet?
When your pet has ongoing symptoms or a complex medical condition and your regular vet recommends seeing a specialist, it can feel overwhelming. That’s exactly where we come in.
Our internal medicine doctors have completed 3 to 4 years of advanced training beyond veterinary school and are board certified, meaning they’ve passed the highest level of testing in their field. Your pet deserves to have someone who knows how to find answers and get them back to feeling like themselves again.
We commonly help pets experiencing:
✓ Chronic vomiting or diarrhea
✓ Unexplained weight loss
✓ Appetite changes
✓ Increased thirst or urination
✓ Recurring illness
✓ Abnormal bloodwork
✓ Diseases of the digestive, endocrine, urinary, or immune systems
✓ Diseases of the respiratory, cardiac, or blood systems
We frequently diagnose and manage:
✓ Kidney disease (including chronic kidney disease)
✓ Liver disease
✓ Heart disease
✓ Endocrine disorders
✓ Hepatic lipidosis
✓ Inflammatory bowel disease (IBD)
✓ Pancreatitis
✓ Valley Fever
✓ Allergies
✓ Hypertension (high blood pressure)
✓ Cancer-related conditions
✓ Immune-mediated diseases (including IMHA and ITP)
What to Expect at Your First Internal Medicine Appointment
Review your pet’s medical history
Perform a thorough physical examination
Review previous diagnostic tests and medical records
Recommend additional testing if needed
Develop a personalized treatment plan
We take the time to listen, answer your questions, and work with both you and your primary veterinarian every step of the way.
How We Find Answers
When your pet has ongoing symptoms or a condition that isn’t improving, finding the underlying cause is the first step toward effective treatment. Our Internal Medicine specialists use advanced diagnostic technology to identify complex medical conditions and develop a personalized treatment plan for your pet.
Working With Your Primary Veterinarian
Partnering with your family veterinarian every step of the way.
When your pet is referred to us, we work closely with your primary veterinarian every step of the way. We share test results, updates, and discharge summaries promptly so they always know what’s happening with your pet’s care. Our goal is to give your pet the specialized attention they need and then send them back to the vet who knows them best.
Veterinary Internal Medicine FAQs
Not always. While many pets are referred by their primary veterinarian, you’re also welcome to contact us directly if you’re concerned about your pet’s health.
Yes. We work closely with your primary veterinarian throughout diagnosis and treatment, sharing updates, test results, and recommendations to support your pet’s ongoing care.
Yes! Our Internal Medicine specialists provide advanced medical care for both dogs and cats.
Your primary veterinarian may recommend an Internal Medicine specialist if your pet has ongoing symptoms, abnormal test results, or a complex condition that requires advanced evaluation and long-term management.