The German Shepherd is one of the dogs that currently exists in the mod. It spawns in the plains biome and behaves like all the other dogs. They attack mobs that attack the player, and mobs attacked by the player.
Taming in the Copious Dogs Mod is very similar to the way wolfs are tamed, the biggest difference is that you use a dog biscuit instead of a bone. Once the dog is tamed it will not follow you directly. You have to give it a collar, and after that, use a leash on it.
For breeding to be done between two dogs, they have to be 10 blocks near a heat source (fire or torch, not lava). They do not, however have to be near the same heat source. The dogs must have a distance smaller than 15 blocks between them. When the requirements are met, just feed them both a cookie and let the magic happen.
When a dog loses health, you can not feed them directly. You have to place down a dog dish and fill it. When there is enough food in a nearby dog dish, the dog will come over and start eating. The dog only eats if there are enough food in a dog dish to heal it completely.