When I first got Duke, my friend down the hall has a chi/pom mix Bella who is 6 months older than Duke. Once Duke got all his shots, we both held our own dogs in our arms and let them smell each others first.
Duke was a bit smaller than Bella (who is spayed). We then let them down on the floor together while we both were there. Duke was smelling Bella's behind for a while, which I thought was the funniest thing ever.
We only let them play together a little bit each time. Eventually, they got along great, they shared each other's toys, food, pad...we even left them together while we both were at work. They learned the other's name and looks forward to playing with each other too.
I'm sure you guys will be great, the only thing I don't know is the heat question as Duke was still young and Bella was spayed.
Good luck
__________________  *Owned by a Yorkie name Duke* |