A. It's often difficult to tell whether lumps, if what you're talking about is actually inside the abdomen, are normal or not. A vet is trained to "palpate" or feel the abdomen and discern the individual organs, and whether they feel abnormal or not. There are many structures in there, from kidneys to the liver to lymph node. It takes quite a bit of training to know what a "normal" abdomen feels like.
If you're talking about a lump you're feeling under the skin, this could be something benign or malignant. Hopefully it's nothing serious, but it's best to get it checked out. And you should be aware that a ravenous appetite can be the sign of some hormonal diseases, although I've also known a lot of Beagles (which is sounds like is half of what makes up your dog) who were ravenous eaters, so he may be prone to overeating. Your vet can also determine if he's overweight and give you diet and exercise tips for him.
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