> I was physically shaking and felt sick.
> We took his muzzle today but it was hot and he was panting and hates it
Oh Lindy, Bless you! this is miserable for all of you isn't it and my heart does go out to you (as the owner of two reformed breed rescue dogs, trust me I've 'been there and done that!' with worry x)
Firstly, much hypothesis can be bandied around as to fear/aggression but really the internet is
no substitute for you getting in an accredited trainer/behaviourist to assess your dog in the flesh and as it happens. I really believe that things have got to an awful stage for all of you and it would be
most prudent to do this and get this behavior nipped in the bud (pardon the pun!) I can see from your upset that you realise the gravity of the consequences if this behavior continues or escalates.
My gut reaction from what you have written is that we are not looking at aggression.... but I cannot of course put money on that, It would be fool hardy of me to assess a dog's behavior I have not *seen*
The collie 'Nip reflex' should never be confused for 'aggression' but also it must never be used as an excuse for undesirable behavior (In working trials it is a disqualifier) Have a look at this article
Dr.Ian Dunbar -'Bite stop' Bite inhibition As I said earlier this is a case of going back to basic training with this young man. There are lots of good articles out there on 'Bite inhibition' and if you scroll down to the bottom of this page you will see a white box if you type 'bite inhibition' into it and press 'Google site search' it will take you to all the posts that have been made on this forum on this topic. (Lots of good reading for you :))
Ultimately I really do believe that your best bet is to bring in an accredited trainer/behaviorist (you may have to go through your vet for a referral) but ensure that you choose a trainer who uses reward based training and is accredtited by either:
http://www.apdt.co.uk/or
http://www.apbc.org.uk/Very Best wishes xx
and ((Hugs)) for you Its horrible when walks make you feel upset and sick with worry, but with good consistent training this will be a thing of the past.
( I have a Husky who is 5yrs old and a real go anywhere meet anyone dog 3yrs ago it was a very different story!! a howling lunging thug!! I had owned and trained this breed for 12 yrs and considered myself more than competent But having never had a rescue dog and one not from puppyhood (and history relatively unknown) I had absolutely no qualms in bringing in an APBC behaviourist to help me assess and train him...and its not expensive,its only the charlottans that charge £100's! I think I paid about £15-30 per 2 hour session of which I was always given extra time and lots of handouts and invaluable knowledge advise! The joy od this was she could accompany us on walks pre-training and post to gauge behaviours and train accordingly... often noticing things I had missed or was totally unaware of which was absolutely invaluable)
Hope this helps xx