Joe Inglis, a television vet, insists that the time has come to get the country's pets back into shape.
"Action needs to be taken. A weight problem can affect a pet's quality of life and lead to straining of the joints, as well as internal illnesses like diabetes, liver disease and heart disease," the Telegraph quoted him, as saying.
He said the website would give pet owners help and motivation.
"We know diets are difficult and when you've got a pet begging for treats, it's really tough," he added.