Well my roommate's parents have a dog who is pretty much the exact same as my dog. Mine is 2yo, hers (Ellie) is 3yo, so still both pups. Ellie is coming to stay with us for a few days while her dad is in town.
We (unintentionally) had them meet through the sliding glass door, where they both kinda snapped at each other and barked- a lot. We had them on leashes walking around each other outside for a while and they both went crazy barking, there was no calming them down.
Eventually we brought them in the house. Ellie managed to pull away and since Sadie is usually nicer off the leash, we let them sniff noses, but they both growled a little so we pulled them apart. Ellie was locked in my roommate's bedroom with her 2 dogs and we sat outside with Sadie until they both got quiet while sniffing under the door. We took them into the living room, both on leashes, and sat across the room from each other. They whimpered at first wanting to play but soon enough calmed down and were okay being near each other but not touching.
Tomorrow we want to let them actually loose to try to play together. They're both great with other dogs once you get past the initial meeting and they get used to each other. Ellie will be staying with us until next Wednesday, so we want them to get along and be okay with each other as soon as we can. I honestly think they'll be best friends once they're both comfortable. I would just love some suggestions on the best way to go about reintroducing them tomorrow! I think we're going to take them to the dog park (neutral ground) and see how they do there..