My last Border collie had weight problems too. Since he was really overweight, we went to the extreme--from 4 cups of dogfood a day to about 1 1/2. He lost weight fast! Then we got him on a regular diet, excericised him a lot and he was fine. Another thing is, if you can help it, don't give your dog *beef* dogfood. He'll gain weight fast, so rather use lamb and rice which has more nutrients in it. I give Blaze lamb and rice IAMS, and about 3 1/2 cups a day, plus excericise and play with him a lot, and he hardly gains a thing. It's much more healthy too!