Mine is full grown and has never been muzzled by the vet's choice. I asked them to muzzle her one time, because she was very sick and I didn't know how she would react. She did fine. I think that I would ask to see a different vet. Did they put it in his records that he needs to be muzzled?
Misty- Samoyed Mix
Tannor- Golden Retriever CGC
Robyn- German Shepherd CGC
Cats-Thunder, Harley, Miley, Bandit, and Ferah
RIP Boo..Black Lab
"A dog is the only thing on this earth that loves you
more than he loves himself."