We just added Jill to our family last Thursday. I know where you are coming from. I posted a similar topic on Friday because things were not going well for us. Silly me just thought Jack would embrace Jill. That has not happened. But each day has gotten a little better with baby steps towards Jack accepting Jill. The advice given was to make everything as normal as possible for the resident dog because the new will adjust. Give extra hugs as well. Jack was always my baby so the new one has taken to hubby. I think everything will work out just be patient.
You are not alone, I feel your pain!
