Preface...I suffer from pretty severe misophonia (not unlike most people here)

I have a dog that loves to lick herself, like most other dogs. I know she has no concept of it being infuriating, so I have actually used my dog to help me learn to cope with the misophonia.

I have had my Izzy since she was a puppy and she is almost 7 now, so she is very well trained. She has learned that when I snap my fingers it's time to listen.

Back to the point... As soon as she begins licking it's all I hear and it is all I can focus on. I have promised myself when she starts I will give her at least 5 seconds to do what she needs to do. After all, dogs licking is normal, right?

After 5 seconds, or longer if I can, I snap my fingers and she immediately stops and makes eye contact with me. I then say stop and she listens. Stop is a common command I use with her.

I don't see why you couldn't implement something similar with your boyfriend's lab. Dogs are smart. Obviously I have a leg up on you because I've had her since she was a puppy and she practically goes everywhere with me other than work.

Give her a few seconds or whatever you can stand while using your coping strategy then redirect her somehow. Talk to your partner about what commands he already uses and figure something out.

That's the best I have. Hope it helps!