My cat is suddenly lethargic after a food change. Should I see a vet?

Question

My cat is quite active and very responsive, but since 2 days ago he's been unresponsive. He usually runs around in the morning and afternoon but lately he's just been sleeping and laying down all and and night and gets up every now and then to get food. We changed his food (dry food) 'flavor' 2 days ago but it's the same brand, not sure if this is relevant but I'm very concerned because it happened so suddenly, should i take him to the vet or should i just wait until he gets better on his own? Pet's info: Cat | Domestic Longhair | Male | unneutered

Jenna Beyer, DVM, MBA, cVMA · Accepted Answer

There can be many causes for the sudden change in activity level, including unhappiness with the new food flavor, pain from arthritis or another source of pain, GI upset from food allergy or dietary intolerance, anemia, constipation, infection, among many others. I would keep a close eye on his food and water intake, and monitor his bowel movements and urinations. If he is not back to himself in 48 hours, or if additional symptoms develop, he should see a vet for and exam and appropriate diagnostics.

My cat is suddenly lethargic after a food change. Should I see a vet?

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