Your best bet is probuly to slowly interduce them I mean there is going to be conflict no doubt and i understand that you want them to be freinds i own three dogs and two cats my oldest cat taby we call her tabitha tayler (because she acts like Elizabeth tayler) will hiss at the dogs or strike at them and the dogs know its time to leave here alone it took them awhile to figure that out but its fine now and my younger cat beauty she starts everything she plays with them i mean she has literly jumped on lil bits back and they play like to dogs it gets a little loud after awhile so i tell them to stop but i am glad they are friends beauty used to be scared of them but now its okay i don't know if this helped at all but i hope it does and i hope that everything works out okay