I guess it would depend on the environmental conditions and the length of the training, but I have never brought water for dogs for a typical hour or two hour training classes (2 hours, 2 dogs, 1 after the other) with drive time, the dog is without water until I bring them home, could be 3 hours, could be six, depending on whether I have other stops.
Heidi Ho, Odie
Joy-Joy, Bear Cub, Hepsi-Pepsi
Cujo2, Karma Chameleon
Ramona the Pest, Kojak -- who loves you baby?
Tiny Tinnie, Susie's Uzzi, Kaiah -- The Baby Monster.