When rubbing my dogs belly this afternoon I found a lump , its about the size of a 5p round and about a cm thick, its hard but I can move it about , she be 10 in april and shes still like a playful pup , I'm just rather worried what it could be , does the lumps you can move about , are the ones you don't need to worry about , I've also noticed she doesn't seem to be putting weight on , But she goes through the stage one minuet she looks like a fat dumpling then a skinny rake again so I don't think this is anything to do with the lump.
Please help me

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