I have a 5 month old kitten we brought in. Well the 3 year old cat we have is acking crazy. She is hissing and hiding witch ive heard they do, but she also hisses at us and sounds like she wants to attack us. She also doing some weird thing hangs out her tong and kinda pants, She wants nothing to do wih anyone and hides. what should i do? Everytime were near her and the kitten comes within 5 feet she meows real loud and hisses at the kitten.