Can you help me with an issue, please?

I live in a detached house on a quiet "dead end" street. I have new neighbors living next to me. These neighbors have two dogs - one elderly, the other is a young German Shepherd. They are leaving the German Shepard on the back porch - unattended.

I love dogs (went over and gave them a "Welcome" basket filled with dog treats) I also love to garden.

He barks THE ENTIRE TIME I am gardening. I wear Air Pods and try to listen to podcasts but I literally cannot hear it. I honestly don't know how they can tolerate it?

How would you handle this situation? I want to get it right.

Thank you.