New to forum. We have an 8 year old Jack Russell who we rescued at 8 months of age. He is generally a well behaved dog but there are times when he is very strong willed (typical of the breed). Someone once described him "as someone who thinks he is important" - probably a very accurate description - particularly from a stranger at the dog park. He is also very social and loves cuddles and company. We have never had to seek advice for this boy in the past 7 years so I guess that it testament to his good behaviour.
Lately he has been showing a huge intolerance to puppies - anything 12 months and under. This morning he hurt a puppy who is here for 10 days. I am not sure what happened as I was out of the room for one minute but I heard the jrt growl, the puppy yelping. On inspection the pup had a cut on his lip/mouth and had lost a tooth - it was actually lodged between two other teeth and I had to pull it out. The jrt went down to his bed without a word from me. This is where he is sent if he barks unnecessarily or when in trouble.
I have grave concerns that the next incident could really hurt another dog - more so than what the poor little pup was subjected to this morning. I am feeling upset that my dog could be so awful and I am quite disappointed in him - in fact, there was a few minutes where I thought about re homing him (catastrophising - I know).
As this is not the first time he has attacked a pup in the past 12 months I feel I need to take some sort of action. The four times there has been an incident I have not been in the room to witness what happened but believe my dog is at fault as he is the common denominator each time. My other dog (not a jrt) couldn't care less about who is here and what is happening - as long as she goes for a walk and has a full belly she is content. Do some dogs get intolerant as they get older? Any suggestions on how to handle this situation? I am currently keeping the jrt and pup separate. Do I need to rethink minding other people's dogs when the go away?
Any advice would be greatly appreciated.