We had Bella for about 24 hours when we went to a rescue "foster" house to meet Chief. We had seen him on a rescue site, then he "disappeared" from the site, but I contacted them about a dog. They called me back about a puppy that had just been returned from an adoption because the owner was not at home much. As good rescues will do, they said to bring our other dog. So we loaded tiny, baby Bella to meet "Cooper".
When we got there, Chief (whom they called Cooper), looked huge in comparison to Bella. She showed no interest in him. Instead, she spotted a toy and took it. Chief followed, wanting to play. She wanted nothing to do with him. He did the classic dog position that says lets play (hind quarters in the air, front quarters on the ground, head low, goofy smile). She answered by grabbing the toy and hiding under a chair.
He then started acting goofy, jumping, yipping, barking. He once backed up right into a china hutch. Wow, did he look like the dumbest dog ever. Meanwhile, she continued her hard-to-get act. It was kind of like watching my fourth grader flirt at the school picnic. Finally, the foster mom took the dogs in the backyard. That seemed to neutralize the behavior, and they started to play. When they came back inside, they started to fight. Never having had two dogs before, I was rather surprised how vigorously they went after each other. I reassured - many times - that this was normal.
So home Chief came with us. I think Bella has forgiven us, but she can get jealous of attention paid to Chief. And while they still fight, they also play, kiss, and lick each other all the time. I think they'd be pretty lost without each other.