Your dog might be eating a lot but doesn't seem to gain weight or your dog is refusing to eat. Reasons for being a dog skinny are obvious which include loss of appetite, lack of healthy diet, some medical problem, being thin from shelter, or your dog burns more calories than he intakes.
How do I know if my puppy is too skinny?
How to Tell If a Dog Is Too Skinny1The ribs are clearly visible or feel like they lie just beneath the skin, with no fat layer in between.2The hip bones, shoulder bones and spinal cord are easy to feel beneath the skin.3The bones at the base of the tail are protruding.Is My Dog Too Skinny? - Hill's Pet Nutrition
Why does my puppy look skinny but eats a lot?
When a dog becomes too skinny, but is still eating, this means they are usually affected by an intestinal parasite or one which affects the gastrointestinal system. These parasites include: Roundworm: this is a parasitic nematode, usually of the Ascaris genus.
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