We are committed to caring for your pet – while maintaining the highest level of safety for our Associates and pet owners. We thank you for your continued patience and support. 
Read More

Jon Stack

DVM, DACVIM (Cardiology)
Dr. Jon Stack
Veterinary Specialist
Dr. Jon Stack
Dr. Stack is originally from Charleston, Illinois, and has moved back and forth between Illinois, Texas, California, Indiana, and Washington, D.C. He attended Texas A&M University, graduating in 2008 with a degree in Biomedical Sciences. He then moved back to Illinois, attending the University of Illinois for veterinary, graduating in 2012. After graduation, he moved on to the veterinary teaching hospital at Purdue University for a rotating internship. From Indiana, he moved to Washington, D.C., and worked as an emergency clinician at a specialty hospital in nearby Gaithersburg, MD. After two years, he took an opportunity to work in a cardiovascular research lab at Stanford University before moving back to Illinois to complete a residency in Cardiology at the University of Illinois, which he completed in 2020. He became a board-certified Veterinary Cardiologist, working as a Cardiologist in Washington, D.C., before returning back to California with his partner Dr. Sunny Kao to join the doctors and staff at VCA Loomis Basin.

Dr. Stack enjoys all the natural beauty and activities that California has to offer, especially the proximity to the ocean, Lake Tahoe, and wine country. He enjoys hiking and taking his canine companion, Ellie, to the beach whenever they get the chance.
See our departments


Cardiology is the medical specialty dealing with disorders of the heart. Veterinarians specializing in this field are called cardiologists. The field includes diagnosis and treatment of congenital heart diseases, heart failure, and valvular heart disease.

Dogs and cats with heart disease may have symptoms that you may not think are related to the heart, such as lack of appetite, malaise, or fainting spells. Other pets may have no signs and are diagnosed with heart disease when there are abnormal conditions found in a physical examination such as rapid heart rate or a heart murmur.

If your pet has heart disease, it is important to obtain an exact diagnosis so that the proper treatment can be started. At Loomis Basin Veterinary Clinic, we have on-site board-certified cardiologist, Dr. Jon Stack. A veterinary cardiologist has had advanced training in diseases of the cardiovascular system and is the best doctor to provide the diagnosis, treatment, and answers to any questions that you may have.

Symptoms of Canine or Feline Heart Problems

  • Weakness
  • Exercise intolerance
  • Shortness of breath or apparent difficulty in breathing
  • Fast breathing at rest (although don't confuse this with normal panting)
  • Collapse
  • Fainting spells
  • Cough
  • Elevated heart rate

Your Pet's Cardiology Appointment

Although it can be emotionally difficult to learn about your beloved pet's heart disease, it is important for you to know the facts so that you can provide the best treatment possible. Sometimes the diagnosis is much better news than expected. Appointments nearly always consist of a physical exam and an echocardiogram, which is an ultrasound of the heart.

Your veterinarian, veterinary cardiologist, and you will form a team and work together on behalf of your pet. This will ensure that you are able to spend as much quality time as possible with your beloved companion.

What Can Be Done if My Pet Has A Heart Problem?

Many of the same types of diagnostic tools and treatment options that are used to help keep human heart patients alive and healthy are also available to pets. For example, sophisticated diagnostic options (see box below) can help determine whether heart problems are present and, if so, assess their severity. Depending on your pet's particular problem, cardiac catheterization, angioplasty, pacemaker implantation, and cardiac surgery to repair heart defects are available.. In addition, many of the medications used in pets are similar to those that are also used in humans.

VCA Loomis Basin Veterinary Clinic

3901 Sierra College Blvd.

Loomis, CA 95650

Main: 916-652-5816

Fax: 916-652-5975

Hospital Hours:

    Mon-Sun: Open 24 hours

Are you a Primary Care Veterinarian? We have dedicated resources for you.

Loading... Please wait