I feed our cats canned only. What is the best dry food to feed them when we go away? I will put canned out for the first day but will have to resort to dry after that. We can't always have someone come feed them canned every day. One of our cats had a urinary tract blockage when we first got him so he is the one that really concerns me about being on dry for even just a few days. Do I just bite the bullet and get the urinary tract health dry food to be safe even though there are better quality dry foods out there?