Muzzles have there place in helping rehab a fearful dog so they can get out and about but I would use on that you can get treats to them so that rehab can occur while out walking and not take him to many places he can rehease his bad manners.
I started almost 9 years ago with a 9 month old yorkie that had to be muzzled... head halter, martingale and body harness on a double lead to get out to walk with any conrtol at all. Like having a 9 pound shark/croc that death roll on the end of my leash was a sight.
close to 9 years later I can now walk only on a body harness most days.
Good luck.
JL
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"The truth about an animal is far more beautiful than all the myths woven about it." Konrad Loranz |