Our (small) Yorkshire Terrier is almost 12 years old now. Recently we noticed that his rear end looked rather large and swollen which the vet informed us was a rectal prolapse. Apparently this can go at any time so we have the vet's emergency number in case it happens we've to get him seen to ASAP. He also has a crackle in one of his lungs so he tends to cough and splutter quite a bit and has been this way for a while. He was on anti-inflammatory meds for about a year because his leg wasn't right, but then he seemed to hurt it and wouldn't put it down so he was switched to steroids which have helped, though he seems to eat and drink a good deal more nowadays.
Obviously he's not getting any younger, he has a great personality and rarely misses a beat. A few months back the vet said he had the heart of a 50 year old, but that was before the development of the prolapse and highlighting of the lung problem. Hopefully the heart thing is still true. I think he also suggested that the kidneys can go in Yorkies so if he starts peeing a lot that's a sign of this problem. It's hard to believe he's almost 12, the time has gone by so fast.