[gemy]

Here is what I would suggest. Have both dogs on lead when you visit, ie your dog, and your aunt's dog. Then have both of them sit for intro's and take them both on lead out for a walk or in the backyard for a leashed walk around.

Try if both are trained for fetch and retrieve to do that separately in the backyard (fenced in).

Also be ready when you let them run off lead together to intercede in the play, if one gets too excited - both go on leads till they all calm down.

Sometimes what looks like to our human eyes as excited play, is actually aggression of one dog to the other. Always err on the side of caution and safety, believe in that if you feel the play is "too much", that it is, then stop/intercede with the play.