Why is my dog suddenly aggressive and acting unwell with siblings?

Question

My dog has been acting kind of angry and depressed lately. I don’t think he feels lonely because he has 1 brother and 3 sisters. He lost his appetite for a while but has recently been eating more. But now he gets angry at his sisters and brother and jumps at them when they go near him. Why is he like this lately ?? Pet's info: Dog | Chihuahua | Male | unneutered | 1 year and 5 months old | 7.2 lbs

Sara Farmer, DVM · Accepted Answer

Toby could be in pain and acting more aggressive for that reason. He also may have had a behavior change for an unknown reason that is making him fearful of the other dogs. I’d recommend seeing your vet first to rule out pain or another medical condition since he recently had a decrease in appetite.

Why is my dog suddenly aggressive and acting unwell with siblings?

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