Has anyone put their yorkie on a diet,to lose weight and been successful?Poor brittany is having a hard time getting up the steps to come inside.There are only there steps and i have to say "snack "to motivate her to come up them.I have been feeding herf 1/3 cup of science diet light for months and still no weight loss.I try to make her walk on a leash and she will sit down ,like a little mule.She does get a snack but they are lean too.No table food because of a bad pancetitus attack a few years ago.I feel like such a failure .How do i get her to lose weight .I really need to help .Any suggestions.She should weight about 6lbs and she weighs 9.6