[alaskayorkie]

My feeling is your reaction should be the same whether it's an off-leash dog park or a city street. You should always be prepared to protect your dog.

With mine on leash, I position myself between the other dog and mine. If the other dog approaches nicely, and mine are behaving, I usually let them say hi. If I sense any aggressiveness -- or rudeness -- on the part of either dog, I step between them and tell the other owner that mine needs some space.

Here's a great article on interactions like that. It's long but worth the read.

http://www.livingwithdogs.us/article...-to-say-hi.pdf