What Is The Best Treatment/care For An Open Wound On My Dog's Testicles?

If the vet says there is nothing they can really do, then he's probably right. You could use neosporin on the would, but he would most likely lick it off, seeing as how there really isn't a way to bandage the wound. Even if you could bandage it, he would most likely take it right back off again.

It'll heal, give it time. Meanwhile, keep an eye on him and tell him no, or leave it any time you see him going after it.

I have an 2 dogs, and wounds happen. Usually you just have to wait it out.

Great advice Neekie. I was going to say the same thing. It will heal and dog's know to lick their wounds, it's just bothersome to us humans especially watching them lick down there.