But now Cupid sleeps practically on top of the pillow. It seems clear he's trying to get as far away from Clay as he can. And the past couple of nights, after we've gotten out of bed for potty breaks, he goes to the couch to sleep. 
As long as there is no open hostility, it seems possible, maybe even likely, that they will develop into pals.
Though they are both the same gender, the difference in their ages is in your favor. Often (though not always) differences in gender, age, and/or size increase the chances of two dogs "getting along."
When Molly came to live with us (and Esther was included in the pre-adoption interview) she was mostly overjoyed at having a new little sister but there were times when she looked at me (as Molly was pulling on her hound-dog ears or being otherwise annoying) as if to say, "Oh, what have you done?"
Though they are both the same gender, the difference in their ages is in your favor. Often (though not always) differences in gender, age, and/or size increase the chances of two dogs "getting along."
When Molly came to live with us (and Esther was included in the pre-adoption interview) she was mostly overjoyed at having a new little sister but there were times when she looked at me (as Molly was pulling on her hound-dog ears or being otherwise annoying) as if to say, "Oh, what have you done?"
