everyone mentioned it's double the vet bills, double the food, double the mess, etc. but it's also double the love, double the fun, and double the silliness. my 2 boxer boys are so incredibly close it makes my heart hurt watching them together because it's just soooooo sweet that animals can be as in love as people can. they are always sleeping on top of each other, cuddled up, spooning, paws around each others necks, licking each others boo boos, etc. kingston, our newly adopted boston terrier, is developing a relationship with the 2 boys as well. after a long time at the park when everyone's exhausted, then he'll cuddle up to the pile of boxers. it's cute. also, i don't know if it's just my dogs, but i think as long as your dog is well socialized with other dogs he would be okay with another male. i mean, obviously you know your dog and i don't, but i have 3 (as of right now) intact males, and we never have any fights. only constant wrestling. =) just a lot of love.