This happens more often then you'd think. It starts slowly and it's frightening when your little bundle of joy leaps at you... there are a few things you should continue to do at home and implement as needed throughout the dogs life. Here's a good reference with lots of good solid ideas.
Every now and again our furry friends need to be reminded that we have the thumbs.. here's an easy way that speaks to the dog in a language they understand. It's a program called Nothing In Life is Free. It makes them remember pack structure. It's a great thing to practice when they start to think the humans are optional to listen to.