The exact order of who was where when is a bit confusing, but if I understand the situation, the pets were yours but left with Jack, he later had a girlfriend and the pets went with her (it is hard to see how much time passed here) and now you want them per your agreement with Jack before the two of you broke up.
It is unclear why there are are hearings, or in what court.
Your comment about the police does not make sense if, indeed, they are your property per court order. If you have a court order stating that they are yours, and you know who has them, the police should assist you in retrieving them (this would be the simplest way to solve the problem). It is unclear why you wish to hire a P.I.
If you have a family court case open, you could seek joinder of the girlfriend -- bringing her into your family court case -- and the same judge who awarded them to you could then order her to turn them over to you. That might be simpler than starting up yet another court case. But the simplest of all these things would be to track Diane down, and ask for the pets, telling her that you will go to court if you cannot resolve the matter informally. Of course, never threaten anything you are not in fact willing to do.
Answered on Mar 15th, 2015 at 9:26 AM