If you have a dream about a dog snarling, this is a warning against doing something which could potentially harm you. A dog snarls to let you know not to come near it or it snarls before it is about to attack. If you can get away fast enough or you can make sure that you don't offend the dog at all then you can make it out of this situation alive so that you don't have to worry about the dog anymore. If you have a dream about this though, it correlates to your real life situation in that you are going to need to start worrying about your decisions more. If you keep going in to do dangerous things without thinking of the consequences or what might happen if you fail then you are going to get yourself seriously injured somehow.