chrapy Anglais:

The horse flared its nostrils.

Spray this medicine through both nostrils.

while another is loading his gun and/or not keeping the muzzle pointed in a safe direction.

You want to muzzle these people and deprive them of political representation: you are the Pharisees of democracy!

Dangerous dogs should be muzzled.

muzzle a dog

Have you got a muzzle? You can't travel with your dog without one.