The recommended dose of aspirin for cats when used for pain relief is 10 milligrams per kilogram of body weight, advises the Department of Environment and Primary Industries. For feline heart disease, the recommended dose is one 81 milligram tablet twice per week, states Portland Veterinary Specialists.
Although low doses of aspirin are sometimes prescribed to cats, it has a high risk of toxicity. Symptoms of aspirin poisoning include anorexia, bleeding in the stomach, vomiting, hypothermia and anemia, states the Department of Environment and Primary Industries.
Individuals should not give their cat aspirin unless directed to do so by their veterinarian, advises WebMD.