I have 2 4 yr old terriers, and they both are having anal sac issues....impaction (pasty crud on their rears). I've tried to express the sacs myself, but they are still having problems. I'm prepared to take them to the vet, but hate to put them through the trauma if there's something I can do myself to help them. I've started giving them a bit of pumpkin, so hopefully that will help. I suspect that they may be having digestive issues due to the Serestos flea collars we started using....has anybody else heard about potential side effects like that? Anyway, I need guidance. I was wanting to find a healthy dog food as someone suggested....they eat Pedigree Adult Complete Nutrition, and haven't ever seemed to have problems with that. Also, do any of you give your dogs a probiotic? If so, what and where do I get it? I'd appreciate any replies. I'm leaving home for 2 months, and want so badly for my dogs to be well while in the care of my daughter and son in law.