Posted : 7/14/2009 10:25:06 PM
Partly because they stick them where they oughtn't be and the older they get the less forgiving the skin becomes -- sores can develop. My old corgi/sheltie mix used to get one EVERY year in the spring -- **something** use to be in a 'crack' at that time of year and every year Foxy would stick that little Mostlie Sheltie nose in there and scub up the tip of his nose!
It's honestly probably just an extremely good reason to take him in for a "senior blood panel" and have the vet generally check him over -- there can be some particular diseases that will show up in sore skin in a few places and the nose is one of them. Not "nose rot" but degenerative problems that really should have a vet look at them.
The other thing I will say is if you have him eating out of a plastic bowl I'd change to a metal bowl or crock -- it really does hold far less bacteria.