I was told by my vet that I should make an appointment for my dogs ( a golden retriever and a cocker spaniel) to get their teeth cleaned. Normally, this would not really worry me. However, now that they are 8 and I've heard so many horror stories...Im not so sure If this is something I should do. They have had their teeth cleaned in the past (when they were 2 or 3) but now their older. What do you guys think?