However, it's the wrong tool to use on a dominant dog to correct aggression.
But she doesn't dispute food because she knows that we have to power to take the food away while she's eating, make her sit or down before her bowl until told it's o.k. to eat, etc. She will lift a lip if one of the cats tries to steal her food, but she'll politely wait until the cats are finished eating THEIR food before she licks their plate clean . . .
we dealt with food issues thoroughly while she was still a tiny puppy - that's the issue that Labs can get aggressive on (at least as aggressive as a Lab ever gets, which isn't very. Not this one anyway.)
The one I use is not a signal, the sound is turned off, it's an enforcement of a known command. It happens a second or two after the command, only if they aren't moving to act on the command.
However, it's the wrong tool to use on a dominant dog to correct aggression.
Not to simply to zap him for an inappropriate aggression, no, but it certainly can be used to enforce a "DOWN" or "PLOTZ" command, any time, any where, with a territorially aggressive dog. The remote "DOWN-STAY" is the single most important command for a dog that ever works loose. It is the only safe command to give them at a distance sometimes, if they are on the other side of a road, or if they are loose and about to chase something they shouldn't, or if there is a person at the door, or a stranger walking across the yard and the dog goes after him.
The dog is first taught what "DOWN" and means... the collar makes it more enforceable from a distance.