In feline heart disease, restricting exercise is a crucial measure to preserve life. Here’s a summary of the essential questions and answers that pet owners should know.



| Item | ACVIM Stage | Condition Description | Activity and Management |
|---|---|---|---|
| At-Risk Group (Stage A) | No structural cardiac abnormalities, but at high risk due to breed, family history, etc. | Normal activity possible | Regular checkups and cardiac ultrasound evaluation recommended |
| Latent Phase (Stage B1, B2) | Asymptomatic myocardial hypertrophy; risk level distinguished by degree of left atrial enlargement | Daily activity is possible, but avoid strenuous activity | The veterinarian judges based on risk factors such as left atrial enlargement |
| Heart Failure Phase (Stage C) | Currently or previously showed signs of congestive heart failure | Reduce activity and minimize stress | Strictly follow the veterinarian's medication and treatment guidelines |
| Emergency/Refractory (Stage D) | Severe or acute heart failure with poor treatment response | Rest-focused with minimal movement only | Immediate hospitalization and intensive care needed |
The stage of heart disease is determined according to the ACVIM classification (A, B1, B2, C, D) based on cardiac ultrasound (especially left atrial size) and clinical symptoms, and the activity range must be decided in consultation with the veterinarian.

Immediate veterinary visit is necessary for sudden severe dyspnea or fainting
If your cat suddenly starts breathing heavily or faints, it could be a sign of a rapid decline in heart function or the formation of a blood clot. Immediate veterinary care or emergency treatment is necessary, as this can be a life-threatening situation.

Do not force play or activity if your cat frequently tries to play
Even if your cat appears eager to run and play, heart disease cannot be diagnosed based on outward behavior alone. Forcing play can place excessive strain on the heart and lead to serious complications. Always follow your veterinarian’s guidance rather than relying on your own judgment.

A veterinarian who majored in veterinary medicine at Khon Kaen University, Thailand, and completed the IVSA program at North Carolina State University in the United States. Drawing on clinical experience at animal hospitals, he works in the pet healthcare field and is dedicated to building a digital care environment that connects pet parents with veterinarians.
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[1] The Cat, Clinical Medicine and Management, 2nd Edition, 2022
[2] Plumb's Veterinary Drug Handbook, 9th Edition, 2021
[3] Journal of Veterinary Internal Medicine, 35(1):58–67, 2020