Rainbow was a very healthy human woman, and the dogs at the shelter knew that and tried to market her with that in mind, and it successfully paid off when she was purchased by a human breeder. Rainbow was happy to leave the sterile metal cages, but was unaware of her new life that awaited her, she'd been separated from her children, and now she would have that happen to her many times over.
"Alright Rainbow," the dog that bought her, a lanky male Dalmatian, "here's home!" He opened the front door and led her inside.
She sniffed around the house, looking at the different objects and not really understanding what they were. There were different pictures of humans and their babies all along the wall, she didn't know it , but the Dalmatian was advertising his prize-winning human booodlines.
"And here's your first mating Rainbow." He said as he introduced her to a blonde man, a little on the lean side, the two humans started sniffing each other's butts, unaware that just days ago they would've been mortified to do this, but now it was just a part of human nature.
Rainbow, as humans don't have a heat cycle like dogs still did, presented herself to the male, who mounted her as the Dalmatian clapped happily, and started making phone calls to reserve the baby(s) that would be born ahead of time.