How do I select the muzzle type.  I am looking for a muzzle that my dog can wear for longer periods of time when it is with other dogs (which happens a lot in my home as I board dogs).  Module 1 segment 3 really doesn't go into specifics about the types.  Is there a guide available that could hep me make correct selections?

I'm bummed nobody replied to your question! What style(s) did you go with and how was/is muzzle training? Thanks!