Because you know you want to.
I don't care if MBTI theory is not applicable to animals. In many ways it fails to be accurate for humans. So that being said, I will type my pets. You should too!
Reasoning: She likes order and cleanliness and won't except less. She tends to dislike change and prefers to keep things the way they are. She's not very social but usually gets along with the other cats. Her favourite activities include laying on a freshly vacuumed carpet, drinking ice water, and grooming. Her lifestyle is pretty low-key. She's a bit uptight though and has anxiety problems or so the vet has told us. Other interesting trivia about her is that she currently has a prescription for Prozac.
Name: Little Boy
Reasoning: Kindest and most affectionate cat I've ever gotten to know. He has the ability to change people's lives. In fact he helped a person recover from depression and alcoholism. He's definately got some Fe going on there and thinks the best of everyone. He loves to talk, play with feathers, and engage with other people and animals. He however is easily scared by strangers (humans).
Reasoning: She's systematic and sort of evil with a reputation to bite without remorse (literally). People have often mentioned that she is a psycho kitty and can be difficult even for experienced vets. But she has a soft side once you get to know her. She loves to cuddle with someone whom she trusts. Also she has an affinity for treats. She doesn't usually get along with the other cats with the exception of Minster.
Reasoning: Unfortunately she's not the sharpest tool in the shed (actually a little retarded) but a sweet cat nonetheless. She seems to be a bit of a day dreamer so she doesn't always notice what going on around her. But she has no respect for other's personal space and frequently invites herself to be loved upon. She likes to get as close as possible so she can cuddle you all day. Her other passion is food. She LOVES food and will eat just about anything. Sometimes she hangs out with Sophie and other times she plays with Mystery.
Reasoning: This cat is easily bored by the everyday humdrum of our household so she's always inventing games to play with herself and has a love for toys. (Loves to examine things to see how they work.) It's very likely that her goal in life is simply to have fun. When there isn't anything to do for a while she gets in a bad mood. Then she uses her brilliant mind to be destructive. Sometimes this means ambushing the other cats or tearing things apart. Although a bit short tempered she doesn't mean to hurt anyone. Her favourite food is pudding and yogurt.
Sex: Female, er male... I don't really know actually.
Reasoning: It's a hunch. It likes to organise and order the other fish around. It seems to be their leader.
Okay, now it's your turn!