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Dog losing weight
My daughter's Jack Russell x is 9 years old and although as lively as ever, is losing weight, although he seems to be eting okay. She has given him different things to see if he puts weight on, but he doesn't it. Could it just be his age? Any suggestions on wht to give him, or suggestions what food may help? The vet once advised that he should not put on too much weight as he is chihuahua! cross and too much weight on his front would not be healthy for his heart, but he is very thin now.
Merry Christmas by the way.