His ex

So my bf still has contact with his ex she clearly still has feelings for him, and had exspressed regret in ending things with him. They were together five years and share two dogs he collect them when he wants them. She uses this to control when and how she’ll see him and arrange when he can see the dogs. I feel as maybe I should say that me and him are to put things on hold until the dog situation is sorted out I don’t want a love triangle or unnecessary drama or to have to here him bitch about her again. I want to be in the relationship but a relationship with ex’s isn’t for me, surely he can’t exspect to collect the dogs from his ex for the next 15 years?

Any advice