Went to the vet the other day. Buster weighed in at 143lbs. Vet said he was 50lbs overweight. He's 7yrs old. He hasn't been 90lbs since he was 10 months old(not fat). I think 50lbs would be too much for him to lose. He would be perfect at about 115-120. Does any one have a good training regimen for him to lose the unwanted weight?