I've spent the last few days looking for this fic, but I can't find it anywhere. Here's hoping someone else recognizes the story and fingers crossed it didn't get deleted.
Jensen (girl in the story) is walking her dog when Jared notices her and doses her with ketamine (I think). When Jensen wakes up, she notices she's in a kennel/cage and she hears a bunch of dogs barking. Jared appears before her and tells her she's his new bitch.
It's not "Kennel Training", though I admit it sounds familiar.
[It's also not "The Art of Breeding"]
Details + what I remember of the ending under cut
Jensen's dog is called "Buddy".
She's treated like the other dogs [hosed down, dog bed]
As soon as she notices she's in the cage, she laments being such a good girl, because that means she can't pick the lock.
Jared raped her after her kidnapping, before she woke up.
He keeps calling her "bitch", which Jensen doesn't understand/can't believe.
Jensen ends up pregnant [though first she thinks something's wrong] and Jared convinces her it's from the dogs, because [to her knowledge] she's only ever been with dogs.
Jared searches around for pups, so he can replace the human baby with a dog litter. This causes a mindbreak in Jensen, fully convinced she's not actually fully human anymore.