your dog will probably be jealous regardless what you do, but to what degree, you wont know until you come faced with the situation. my dog gets jealous when i am on the phone! lol(i think its cause i am talking to ‘the phone’ instead of him :P) but there are ways to prevent or lessen the jealousy issue. i am not going to pretend i know everything about you and your dog(each dog is different, there are some better training methods than others, but each depends on the dog and family environment). nor do i know your dogs alpha/sub tendencies..but heres a few tips : 1) if you can, obtain a blanket/toy from the place where you are going to get your kitty from. if need be, give them a towel or rag for the cat to lay on and pick it up the next day. introduce the object to your dog. this way the kitty wont be a brand new smell, once you bring it home. (this may be impossible for you, if it is dont worry -i was just taking this from what you should do when bringing home a new human baby:P) 2) whatever you do, try not to deter from your normal schedule with your dog. this means DO NOT give him more love and attention than usual( just because there is a new one in the home and you are trying to compensate from any feelings of guilt) ~because there will come a time when the thrill of the new one is over and the ‘siblings’ are used to each other, where you’ll stop the over attention. this in itself can cause jealousy issues even if there were none to begin with. (ex: first hes the lovey dovey one, now nothing) So that is why its important to not do anything different. … a change in routine could signal to the dog that things really are different now , and that could cause issues too. ..if you feel your dog is getting left out, then pick an activity only you two can do(if you dont already) ~even a quick training session(or recap if hes already trained)… if training is made fun, dogs love it. it becomes like a bonding session between dog and owner. 3)also (for a possible prevention of aggression towards kitty), your dog will automatically see itself as a higher rank in the pack(your family), then the kitty. this could(may not make a difference at all, too) cause problems if your dog sees his rank being threatened by the cat. (ie: more attention to kitty, kitty comes first, etc etc~~but more than likely, the kitty will grow up and have the dog under its thumb:b)—So, things you could do: when coming home, greet the dog first, feed the dog first, acknowledge the dog first, then the cat. .. i have found my cat is jealous of anything and anyone i even look at (i dont know how i got stuck with these obssessive/possessive pets .lol).. if i happen to greet the dog first, the cat glares at dog and swats it in the face as she runs off. she wont have anything to do with me if i dont speak to her first…. its too funny. but then again that is a cat. i hope i didnt lose you in the answer and i hope this helps and serves as a general guideline or basic tip to start out with. you probably are worrying about nothing, but it is always good to be prepared. good luck with the new addition! 🙂