Interaction with other dogs

If your dog has, how does your dog react to other dogs when it sees them or gets near them?

Is there anything specific that he/she does?

For me, at least, sometimes when my dog makes eye contact with another dog they'll look at each other and then start to move closer to one another. They don't really do anything after that because generally I don't allow my dog to get near other dogs for fear of something bad happening, but what when your dog sees another dog, how does it generally react with them?