Like humans, dogs can gain weight for a number of reasons, including poor diet, inadequate exercise, changes in metabolism, and certain types of illness. Although certain breeds are somewhat predisposed to weight gain, any dog can become obese.
What illness causes weight gain in dogs?
Chronic illness. Chronic conditions like Cushing's disease (hyperadrenocorticism) or hypothyroidism can also cause weight gain in dogs.
Can parasites cause weight gain in dogs?
Intestinal parasites rob a pet's body of nutrients, which can cause weight loss. However, a severe infestation of these parasites can distend a pet's belly, making it look like a pet has gained weight.
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