The best replacement for muzzle is shock collar.

The best alternatives to muzzle are rated as following:
★★★★★  shock collar
★★★★  bark collar
★★★★  snout
★  open muzzle
★  basket muzzle
  gentle leader
  not to muzzle

Your alternative for muzzle is not listed? Suggest!
Speaking about muzzle, one probably shouldn't forget about halti.

Other search terms related to muzzle and their ratings are:
★★★★★ halti
★★★★ leash
★ gentle leader
You have in mind a companion for muzzle and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of muzzle in all years. Click on graph for more.
muzzle
shock collar
bark collar