Why can’t my dog gain weight?

There are many reasons a dog cannot gain weight, including improper diet, excessive exercise, parasite infection, poor intestinal absorption, high stress, and illness. If the diet lacks balanced, necessary nutrition, the dog becomes thin over time. Too much exercise also burns excess energy and lowers weight. In addition, internal parasites absorb the dog’s nutrients, causing poor nutrition and weight loss.

If the dog is thin and shows other discomfort, take it to a vet for examination and treatment promptly.