i went to the animal shelter to adopt a cat. There was a man outside looking to give away his cat. I felt bad and decided to take his cat home too in addition to the cat from the shelter. The cat from the shelter had adapted well. The other cat is hiding in a corner. The man gave me its bed, toys, food and bowls. When the shelter cat approached it, it hissed at it. I was petting the other cat and after a while it began hissing at me. I don’t know what to do.