You are a very observant person LittleSkinny! I haven´t think about that. Well, I know from interviews I have read that Layne loved very much animals, specially cats, when he died, Jerry adopted his cat, if you have seen Jerry´s MTV cribs, he showed Layne´s cat. Jerry loves animals very much too, he has a ranch with horses, cats, dogs, cows and other farm animals and he colaborates with an animal foundation (I don´t remember the name). I don´t know if Sean and Mike love animals too but I´m sure they do because they seem to be nice people
and nice people love animals.
A lot can be told about one´s character by the way they treat animals.
Hope that help to answer your question a little bit.
Take care 
What does friend mean to you? a word so wrongfully abused