I have read
In League With Serpents by WeyrWolfen and would recommend it to anybody who likes Spuffy but with a Spike who is caring without being a doormat. In this story, Spike finds a very special pet, and this sets him off on a series of exciting adventures and eventually helps him earn the acceptance and respect of the Scoobies.
http://spikeluver.com/SpuffyRealm/viewstory.php?sid=15577That said, I would like to know about more Spuffy fics where one of the gang obtains a pet of some kind. It can be any kind of pet, and it can be any timeline/genre as long as it is NOT all-human. Also, it should not be just someone getting turned into an animal, unless the other characters actually adopt them as a pet without anyone knowing that it used to be one of the gang.
To sum up:
1. An animal is adopted by at least one of the main characters as a pet.
2. Said pet can be anything - even a demon.
3. Any season or genre EXCEPT all-human.
4. If said pet is an existing character turned into an animal, the others do not know that it used to be someone they know.