can anyone suggest a muzzle that my GSD cannot get off, she is a lovely girl but does not like other dogs, so to be on the safe side i like her to wear a muzzle  but no matter which i choose she gets it off her nose, she only has it on when we go for a walk. thanks

I'd suggest training her to accept the muzzle as being for *nice* things by rewarding her when she interacts with it to start with, maybe just letting it sit by her food bowl while she eats to start with.  The Baskeville muzzle is good as you can give the dogs treats through the space in the front.

she is nearly 6 yrs old and has been using the muzzle for about 3 yrs so she should be use to it by now

Oh dear, it looks like sadly she's learnt she *can* get it off, and will try all the harder I suspect what ever you put on her :(  Out of interest, what muzzle are you currently using?