I am new and hoping you can help.

We have 2 dogs one is a 12 year old smooth haired JRT and the other is a 5 year old rough haired over sized JRT.

Previous to this we had a rescue JRT who died in 2002 but taught the old boy all he knew about hating other dogs.

with me so far?...................Good!

They get on really well with old boy being the boss.

Alfie (the 5 yo) has always been fearful agressive to other dogs, we took him to puppy socialisation, where all the other dogs were huge breeds and he sat under my chair growling and taking snaps at all these gormless friendly puppies.

He went to Dog training and was star pupil (in terms of commands) but had to kept separate from the other dogs.

We took him to a behaviourist when he was under 12 months and he attended some classes for aggressive dogs but they appeared to make him worse as he only had bad experiences of other dogs.

We have spent the last 4 years avoiding busy places, keeping watch for other dogs and only letting him of the lead in really remote locations.

In every other way he is a complete dream, but we have recently purchased a camper van and realise that we are going to come into contact with a lot more dogs than we are used to.

Today we took him to the park and a very small terrier came bounding up to our 2, we had them on leads and his owner was a long way off with a tethered Rottie so couldnt do anything. Alfie picked this dog up by its head and shook and slung it like a rat then got hold of it again, my OH had to prise his teeth off and it ran off yelping. I checked it was Ok with the owner wasnt overly impressed but hey she should have had it on a lead, her attitude was its got to learn but I think this is daft its gonna learn not to trust other dogs.

Anyway we are a bit sad and realise we need to do something, thing is is it too late to try and address issues at 5 years old?