I've taught our Black Dog a lot of tricks over the years, many of them using a clicker and treats. This is one that he loves.
Balance the treat on your nose until I say the word.
As soon as I say it's okay, launch the treat.
Then, the part that is hard for a blind dog - catching the treat.
I decided to use our training skills to teach him to scratch the board that will file his nails. The board is a piece of plywood. It has grip tape stuck to it. This tape is usually used to give people traction on stairs.
Because he can't see, I needed to let him know that a new object was in front of him. I tapped it so he'd hear it. Then, because he has lots of experience with "shaping" (where I click/treat any behavior that is getting closer to what I want) - he immediately started sniffing the board, knowing that he'd need to interact with it. I rewarded that a few times, and then I waited for him to put a paw on it. You'll see that he did that pretty fast.
Then, we stalled because the board wasn't stable enough for him. I cut out some video until I put the board flat on the ground. When I switched it to being flat on the ground, R tried standing on it with his front paws. I decided to wait to see if he'd try a digging motion. Because we've done a lot of shaping in his life, he didn't give up when standing on the board didn't earn a click/treat. He got a little agitated but, voila, he tried to dig on the board pretty fast!
Here's the video.