Agree Anja I suggested earlier they have another chat before going the official route.
Having said that, many years ago my cousin took my beloved dog after my marriage broke up and I would've had to leave him all day. It crucified me and I still think of it to this day but it was best for him. I've since had a lot of dogs and train/gundog train them but who knows what's around the corner. I would, at least, now, be able to afford to have help should something happen.
In OP's situ though, I would chat to them again and see if there is anything that can be resolved. It sounds like they're a volatile couple anyway, so the dogs could well end up in a rescue centre and the couple going their separate ways.