It can be difficult to know the ideal healthy weight for your pet, but there are a few signs and tests to determine if your pet is underweight, ideal weight or overweight. First, you should be able to feel your pet’s ribs under their fur and skin. If you can’t, they may have too much fat. Another test is to look down while your pet is standing up and make sure that they have an hourglass future where their waist is smaller than their ribs. If you can see each of your pet’s ribs, then they are underweight, but if their waist is in line with their ribs, they may be overweight. You can also use an online tool, such as this one from PetMD, that will help you determine the perfect weight for your pet.