My boy was 9 months old when I had him in an OB class. He ignores other dogs. My instructor placed us next to a crazy dog and he still ignored. If he even glanced at the insanity next to us, I'd just say "leave it".
I remained calm. He remained calm. He still (at 3) ignores other dogs.
Hondo Von Dopplet L Bauernhof "Hondo"- GSD
Lilie's Tug McGraw "Tug" - Golden Retriever
Maggie - Mini Dachshund (Rescue)
Lonestar - Texas Blue Lacy
Funyon, Ashe, Soot - Barn Cats
Scooter /1/2 Arabian, Shadow, Katie / APHA