BluePearl Pet Hospital
Sandy Springs, GA
Internal Medicine

24/7 Emergency and Specialty

Pet internal medicine by BluePearl.

Solving the puzzle to help your pet live a longer and better life.

We understand that seeing your pet experience unusual symptoms or act out of the ordinary can be stressful – especially if you don’t know what’s wrong. Fortunately, our veterinary internal medicine team is made up of experts in diagnosing and treating diseases of your pet’s various body systems, and we’re here to help. 

Our commitment is not just to treat illnesses; it’s to enhance the well-being of your pet and be with you every step of the way.

A vet specialist holds a small grey puppy wearing a cone on an exam table.

Conditions we treat.

A BluePearl anesthesiology and pain management vet prepares to fix an anesthetic facemask on a yellow lab while a vet tech helps hold the dog on the exam table.

If your pet has an acute or chronic condition, you’ll have an entire internal medicine team helping to improve your pet’s quality of life so you can get back to what matters most – spending precious moments together.

  • Respiratory diseases like asthma in cats or bronchitis in dogs
  • Autoimmune diseases such as lupus or Addison’s disease
  • Gastrointestinal diseases, including inflammatory bowel disease or pancreatitis
  • Liver diseases like hepatic lipidosis or cirrhosis
  • Kidney diseases such as chronic urinary infection or renal failure
  • Endocrine diseases, including Cushing’s disease or diabetes mellitus
  • Hematologic diseases like hemolytic anemia or thrombocytopenia
  • Infectious diseases such as leptospirosis or blastomycosis

Services we offer.

Your pet will receive unparalleled medical care during their time at the hospital (and they’ll be spoiled with love and attention, too).

Advanced diagnostics

Your pet can’t tell us what’s wrong, so we use sophisticated diagnostics and imaging tools to uncover the source of the problem.

  • Blood/urine testing
  • Radiography (x-rays) 
  • Ultrasound
  • Endoscopy
  • Biopsies

Treatment plans

Just as no two patients are the same, neither are their treatment plans. Our internal medicine team has experience with a range of advanced procedures and minimally invasive options to get your pet on the path to wellness, including:

  • Medication 
  • Nutritional support 
  • A variety of surgical options

Our board certified specialists and internal medicine team.

Experience makes all the difference. 

Our internal medicine team is made up of veterinarians, vet technicians and assistants, and support staff with rigorous training and experience in specialty medicine. The team works hand in hand to provide the comprehensive, compassionate care your pet needs and deserves. Because we’re a multidisciplinary hospital, the team can consult the expertise of other specialty departments, too.

Nicolas Berryessa

Board Certified in Veterinary Internal Medicine

Internal Medicine
On the job

Dr. Nicolas Berryessa has interests in gastroenterology, respiratory diseases, endocrine disorders, infectious diseases and immune-mediated conditions. He leads the radioiodine I-131 program for cats with hyperthyroidism at our Sandy Springs hospital. He also performs interventional procedures such as urethral, tracheal and nasopharyngeal stenting. Dr. Barryessa has authored articles on various infections.

  • Diplomate, American College of Veterinary Internal Medicine
  • Residency, Small Animal Internal Medicine, University of California, Davis
  • Internship, Small Animal Medicine & Surgery, Georgia Veterinary Specialists, Sandy Springs
  • Doctor of Veterinary Medicine, Cornell University, Ithaca, NY
  • Bachelor of Science, University of California, Davis
Off duty

Dr. Berryessa enjoys podcasts, running, movies and drinking coffee. His wife is also a veterinary specialist. They enjoy spending their time with their three children, two dogs (Otter and Raya) and quarter horse (Moose).

Olga Norris

Board Certified in Veterinary Internal Medicine

Internal Medicine
On the job

Within the internal medicine specialty, Dr. Olga Norris’ clinical interests include endocrine and gastrointestinal diseases. She especially enjoys feline medicine.

  • Diplomate, American College of Veterinary Internal Medicine
  • Residency, Small Animal Internal Medicine, Kansas State University, Manhattan
  • Master of Science, Kansas State University, Manhattan
  • Internship, Small Animal Medicine & Surgery, University of Missouri, Columbia
  • Doctor of Veterinary Medicine, Auburn University, AL
  • Bachelor of Science, Biology, University of Alabama, Birmingham
Off duty

Dr. Norris and her husband enjoy traveling, cooking and hiking. They have two poodles and a cat.

Leslie Shelnutt

Board Certified in Small Animal Internal Medicine

Internal Medicine
On the job

Dr. Leslie Shelnutt enjoys all aspects of internal medicine. Her particular interests include immune-mediated, infectious and gastrointestinal diseases.

  • Diplomate, American College of Veterinary Internal Medicine (Small Animal Internal Medicine)
  • Residency, Small Animal Internal Medicine, Michigan State University, East Lansing
  • Internship, Emergency & Critical Care, BluePearl Specialty + Emergency Pet Hospital, Sandy Springs, GA
  • Internship, Small Animal Medicine & Surgery, North Carolina State University, Raleigh
  • Doctor of Veterinary Medicine, University of Georgia, Athens
  • Bachelor of Science, Agriculture, Animal Science, University of Georgia, Athens
Off duty

Some of Dr. Shelnutt’s favorite pastimes include traveling, running and hiking. She has a Labrador named Gwen and mixed breed dog named Meredith.

Publications & Articles

What to expect.

We want you to be prepared for your pet’s visit to the internist, so you have one less thing to worry about. Our entire BluePearl team will be with you every step of the way.

Before your visit

  • Make an initial appointment by calling us directly or via referral from your pet’s primary vet. 
  • We’ll get records from your primary or emergency vet before your first visit and collaborate with them to discuss your pet’s history and current condition.

During your visit

  • When possible, we’ll examine your pet with you by their side to make them more comfortable. If additional tests are needed for a diagnosis, we’ll discuss those options with you.
  • You’ll have plenty of time and opportunity to ask questions as we go over your pet’s diagnosis together.
  • Before you leave, you’ll receive a detailed treatment plan, discharge instructions and any recommended medications. We’ll schedule a recheck appointment and make sure you’re aware of any symptoms you should watch out for at home.

After your visit

  • Our team will continue to partner with your primary veterinarian as part of the ongoing management of your pet’s care.
  • You know your pet better than anyone, and you play a crucial role in their treatment plan. If you have any concerns about providing care at home (such as giving medication, maintaining a specific diet or monitoring your pet’s symptoms), let us know – we’re here for you.