My dog ate 30 fish oil capsules... will he be ok?!?

That really kind of depends, fish oil is good for dogs, and occasionally vets have prescribed up to 2-3 times the recommended dose on the package for some dogs. So he'll probably be fine unless he has some sort of liver problem, where he can't process that much fish-oil (unlikely), has a blood problem or is prone to bleeding (also unlikely, but can have serious side effects, fish oil slightly thins blood in high enough dosages) but the most common side effect of that much fish oil is that your dog's breath will smell like a fish until it pes through the system completely.