Getting dogs to wear a muzzle

[jagracer]

I have two Jack Russells, one of which has taken to snapping at larger dogs. The other JR then has ago at him and sometimes it can kick off. I'm at a loss how to stop him having a go at other dogs so I hope a muzzle will stop the problem. The trouble is keeping the muzzles on them, I've been trying with them round the house and as long as I keep in contact with them they aren't too bad and accept wearing them. Today was thew first foray out to the park and neither of them were having any of it the muzzles reluctantly stayed on until the park gate but they both forced them off with their paws and it ended up with one wedged half in and half out of his mouth and me with a cut finger where I caught it on one of his teeth trying to free it. I'm at my wits end as one or both of them is going to get hurt if they pick on the wrong dog and I want a quiet walk not one fraught with anxiety about them being a nuisance.
Any help or ideas welcome. I've bought hard plastic type btw.

[jagracer]

Both neutered, the male is built like a brick sthouse and has attitude, he doesn't bite but will run at a dog and barge into it or snap if it wont play with him. He is very strong willed and will wander off and loses himself in his own little world at times. Female although quite small can be very dominant.

[jagracer]

Thanks for the replies but sadly things deteriorated on Saturday to the point that the dog attacked me when someone came to the door and I tried to pick him up to calm him down. I've now made contact with a doggy behaviourist who reckons he can help us. I think a lot of it is my fault for not accepting the problem soon enough and I'm obviously going wrong somewhere but hopefully we can both be straightened out and I will be able to keep the dog.

[jagracer]

Silent1 said:

Sounds like the dog doesn't know who's boss

I think you're right.

[jagracer]

Is he allowed on the couch?.............................Yes
Is he made to wait for his food?........................No
On a walk does he pull?.................................No
Does he rush through doorways before you?...............Sometimes
Can you take food off him?..............................Yes
Does he stay on command?................................No

[jagracer]

The food business has never been an issue apart from when I first got him as I had to coax him to eat. He was re-homed with me at about age 2 and although someone who knows his past says he had no issues, I'm not so sure.
Since all this kicked off the couch has been by invitation only.
The man I spoke to today suggested seeing a vet as well but said he will check him out when he comes round.
He is one very subdued dog at the moment, he knows he's done wrong. I know I've done wrong in my approach to him and hopefully we can get it sorted.