I have 3 mixed breeds, all shelter dogs. Decided to go with mixed breeds after seeing the horrible conditions at puppy mills, which is where most pet store puppies come from (check out www.hua.org for an eye opener). My doggies are all healthy, smart, and, of course, spoiled rotten. My oldest dog, Sweetpea, is 14 and has doggie alzheimers and we are struggling with the decision of whether to put her down or not. It is never an easy decision.