What happens if a dog is too thin?

A dog that is too thin can face a series of health problems: low blood sugar, muscle loss, dry coat and weak bones, and if still growing, poor bone and muscle development.

Underweight dogs also tend to have digestive issues such as poor appetite, vomiting and diarrhea, and their immunity may suffer, making them easier to infect than other dogs. If your dog is too thin, take steps to help it gain weight and check its health.