Why Is My Dog Getting So Skinny? Weight loss in dogs is the result of a calorie deficit. This may be caused by high energy demands, poor quality food, or a number of health issues. A sudden weight loss can be caused by many different diseases including dental problems, intestinal parasites, diabetes, and cancer.
Why does my dog eat a lot but not gain weight?
My Dog Is Eating, But Not Gaining Weight — Why? If your dog seems to be eating normally, but they're still underweight and not gaining anything, there's usually one of two things happening: you aren't feeding them enough, or there's an underlying issue not letting them gain weight.
Why does my dog look super skinny?
The More Active The Less Heavy. Your dog is so playful and active. He gets too much exercise and burns a lot of energy. As a result, you see him as skinny.
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