Tough problem!
When I get a new pet - occasionally my older one(s) are a little jealous and don't know quite what to think of the new pet for a day or two.
My excercise is just to sit on the sofa with one on each side of me -- (or even one in my lap)..... and having them this close to one another with me in the middle really gives me complete control of whatever they decide to do. If either one decides to get a little aggressive- it is nipped in the bud. And, eventually, they give up and decide to just relax and put up with one another's company.
And - at my house anyway - all of my pets become fast friends quickly. They learn quickly that no other type of behavior will ever be tolerated.
And that they might as well just become good friends and enjoy one another.
Good luck - Carol Jean |