you must socialize puppies when you first get them and keep on socializing them. that is the key. pups go through a "scared" stage and it is very important that you socialize them when they do go through that stage. perhaps obdience classes would help you at this point. Do you have a dog park? and a petsmart? perhaps that will help socialize him better.. obdience classes, going to the dog park, and to petsmart so he's used to being around other dogs AND people. make sure you do this with your other 2 pups, too. it is very important to socialize them and keep socializing them.

Buster my hound is like this.. he used to walk so well on leash and he went through the "scared" stage and now it's hard to take him for walks. He tries to back out of his collar. we don't have a dog park or anything like a petsmart except Quality Supply. he is better now, though. I wish you the best of luck with your 3 and hope this helps Cainan. and please socialize the others the same if you haven't already!