Sudden weight gain or bloating can be a sign of cancer in dogs. If your dog is eating less but seems to be bulking up, take a trip to the vet, says Rocha. A sudden spike in appetite also warrants a visit.
General pain or discomfort
“Pain is a rather substantial sign of cancer,” says Zaidel. If your dog whines or cries out when you pat her tummy or pick him up, call your vet. Mouth tumours may cause noticeable discomfort when eating.
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