It depends on how much damage the other dog inflicted on yours. If it was just a little scuffle; make sure you have your vet give him a through examination to make sure nothing major is damaged.If...
Keep it on a leash around dogs you know it doesnt get on with, or on first metings with other dogs. Don't take them of it until you know how there relationship is going.
i know this sounds insane but really what you need to do is take them on a walk together if possible. the walk should seem relaxing and this will help them relieve tension between the two of them...
Sometimes if dogs bark at each other alot, and then jump on each other, It's just their way of saying hello. Playing in a rough way. But, if they bite, scratch...etc then... Mabye It's just because...