unpopular opinion from me I'm sure but since I have had a rescue for 30 years I know the deal with your wife and the dog. So I say to you don't be a toad, you are splitting up anyway, and just get in writing that the dog is her responsibility when your split occurs.
This isn't really about the dog in trouble. It is about how abused you feel. Who is keeping the dog you already have?
unpopular opinion from me I'm sure but since I have had a rescue for 30 years I know the deal with your wife and the dog. So I say to you don't be a toad, you are splitting up anyway, and just get in writing that the dog is her responsibility when your split occurs. This isn't really about the dog in trouble. It is about how abused you feel. Who is keeping the dog you already have?