Melinda Shore wrote:

I'd be concerned about restraining a biter by the collar and
making the problem worse,

Leash aggression, mayhap? Actually, that can be a recipe for a
committed biter to come up the leash at you, if the dog gets too
frustrated.

--
Shelly
http://www.cat-sidh.net (the Mother Ship)
http://esther.cat-sidh.net (Letters to Esther)