Rita I know you have been following Bud's problems. Bud is a picky eater as well, I just bought some high dollar Taste of Wild and he does not care for it any more then Pedigree. He does the same thing pick the wet out of the dry. Last night I gave him some cooked fresh fish and today he had a grilled hamburger. At this point I just want him to eat. I buy green beans and broccoli to add to there food, he likes fresh tomatoes and cucumbers as well. The other Collies are not picky eaters but like fresh food better then dog food and I can't say that I blame them. Brosted chicken is a favorite as well. I try to make sure lean cuts and no salt.
When Strider had cancer I gave him Sam-E for his liver as well. That may help.