When giving cats omega-3, you should be giving them approximately 100 mg of EPA + DHA a day. This is the general amount recommended for maintaining their health. However, if your cat has chronic kidney disease (CKD), then you can consider giving them 200 to 300 mg of EPA + DHA a day. However, as long-term and excessive intake of omega-3 can have unwanted side effects, caution should be exercised.
Recent research has reported cases of an increased risk of atrial fibrillation (a type of arrhythmia) in cats who consumed high quantities of omega-3. Additionally, overconsumption of omega-3 can impede blood clotting, so owners should strictly adhere to the recommended guidelines.
Thus, owners should monitor their cats' conditions and adjust their dosage of omega-3 as needed to ensure the safety and health of their cats.