DateMyPet.Com
A community for pet owners looking for love or friendship.
www.datemypet.com

EquestrianCupid.com
Where equestrian singles feel at home.
www.equestriancupid.com

dateFetch
Where people who love their pets find love.
www.kissykat.com

LoveMeLoveMyPets.Com
A place to meet pet-loving singles like you for making friends, find a new love, or just have fun.
www.lovemelovemypets.com

Animal People
Because pets bring people closer.
www.animalpeople.com

Equestrian Singles
A site for uniting horse enthusiasts around the world.
www.equestriansingles.com

Horselovers Connections
A personal ad dating service where single horsepeople find friendship, romance and love.
www.horseloversconnection.com

Match.com (review: match.com)
Option for "I have, I I like but don't have, or I don't like" the following types of pets using custom search.
Birds
Cats
Dogs
Exotic pets
Fish
Fleas
Gerbils / Guinea Pigs / Etc.
Horses
Reptiles
Other
www.match.com