Clearly the answer is for all dogs to just default to Gusto's first line of defense when a dog gets too pushy/rambunctious/scary. Throw yourself into your safe spot. This was his reaction when the big, intact male lab that he was playing with on the beach suddenly got a little too intense for his comfort:
It's a great plan, and he has the same reaction to truly scary dogs we encounter. It works wonderfully until the dog in question starts to try to climb me to get to him. Luckily it is usually just the stupid happy ones who do that; the one time we came across a dog that I was really concerned was going to hurt one of mine, he threw himself up there and I was certain I was going to get my face bitten off by the other dog. Thankfully I had the Angry Reactive One on leash in front of me, keeping the dog at bay.

It's a great plan, and he has the same reaction to truly scary dogs we encounter. It works wonderfully until the dog in question starts to try to climb me to get to him. Luckily it is usually just the stupid happy ones who do that; the one time we came across a dog that I was really concerned was going to hurt one of mine, he threw himself up there and I was certain I was going to get my face bitten off by the other dog. Thankfully I had the Angry Reactive One on leash in front of me, keeping the dog at bay.