My 14 year old part chow bit me today while I was trying to take off his collar to put in a new powercap. I have an invisible fence and noticed that my dog had gone beyond his allowed perimeter. He has had his rabies shots.
I am taking him to the vet to see if he has any health issues. Lately, he has shown aggression toward the meterman and the terminix man and now me. I went to the ER and was given antibiotics for infection and lortab for pain if I needed it. Xrays showed I had no broken bones in my hand.
He is 14yrs, he may be hearing different, and seeing different. Unfortunatly getting old sucks. Older dogs can also be in pain due to arthritis or some unknown ailment. It is hard to say, but as a groomer I have seen alot of dogs, both mixes and pure get agressive as they get very old.
Sometime your vet can not diagnose some of the old age ailments. Keep in mind, although I am sure he is a healthy happy guy right now. do not put yourself in danger as he gets older.