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Young dogs can react unpredictably to electric dog fences, so understanding a puppy's development is essential to deciding when to start training the animal with the fence and collar. Generally, puppies should not be introduced to electric dog fences until they're at least four or five months old.
In any case, even if you do, both dogs should not be in the same obedience class. The Lab can go to an adult training class, but the Dogo should go to a puppy class (10-12 weeks). Some places will take puppies as early as 8 weeks, but you have to make sure that your pup is well-updated on shots. I'm really not sure about taking two dogs to be trained at once. Generally, it's not a good idea.