supersized spaniel was so big he could barely move. when mack and rose welsh adopted him. >> he couldn't close his legs at all. they were that wide apart. >> reporter: so they sign up their dog who -- signed up their dog for britain's pet fitness class. with more than a third of dogs overweight or obese in england the group is helping pets transform their bodies as part of a six month fitness program. just like people obese pets are more likely to have heart problems, diabetes and other complications. veterinarian pendableberry says you should be able to feel the ribs through the skin. >> the ideal shape is to have the waist coming up like that. you have that svelte appearance there. >> reporter: one of the biggest mistakes people make is overfeeding their pets she says. >> it's ideal if you're a couch pro typo, one biscuit for me and one for the dog. but when you think about it the requirement for a dog is very much smaller than ours. >> reporter: one human treat alone can give a cat or dog a quarter of the calories its needs in a whole day. >> unbelievable. 15 inches. >> wow.
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