You are not giving the animal enough time to get adjusted. He is bound to be scared off bigger animals. Let the matter ride for now.
I Want My New Kitten To Stop Hissing At Any Animal He Sees Because If He Does Not We Will Have To Give Him Away Please Help I Do Not Want To Give Him Away We Just Got Him Yesterday And I Want To Keep Him But How Can I Get Him To Stop Hissing?
Did you end up keeping your kitten? What kind of kitten was it and how old was he? Some kittens or cats are just temperamental and they may hiss often for their whole life. He may hiss because he's being defensive and he just might be a laid back kitten after all. I'm having the same problem with my kitten right now and I'm thinking she hisses in defense because she's uneasy about her surroundings, however, it has been over a month since we've gotten her and I also think it's her personality as well because my other cat has never hissed once since he was young. He's laid back and doesn't respond the same way she does when he's unsure about something. Good luck!
The only answer is time. That poor baby's whole world just changed and he's scared. Don't try to force him to interact with anyone or anything right now. Let him adjust and get his bearings. How jumpy would you be if everything you ever knew and that was a comfort to you was gone and everything now was new and unfamiliar? It's also generally a 2 to 4 week adjustment period while everyone gets everything sorted out when bringing a young baby home and it's ALWAYS advisable to keep new pet's separated from the existing ones for a period of time in case they are ill (incubating or not obviously ill) and contagious and after that everything should be under supervision while they adjust and figure each other and their placement out. Let everything happen in it's own time and he'll stop. Good luck to you.
Put them in the same room for a couple of minuets and don't let them come out until they get along. That worked with me and my new cat. Good luck!