zee bitter apple, it does nothing!
So much for that idea. Ran out and got a big bottle of bitter apple spray and then hoses down all three leashes with it. Just got back from a glorious walk through a wooded area in our neighborhood.
While the walk was great and Kaiser was well behaved he still enjoyed biting at his leash and the other dog's leashes too. Oh well.
To a degree it wasn't as bad as it was before, but he still did it. I'll hose the leashes down again and see if maybe he'll do it less each time.
I think behavioral modification is going to be the answer. I need to learn to calm him down and give him something else to focus on instead of biting the leash.
What he's doing is like a little kid pulling at his parent's hand going 'come on Dad! The fun is over there! Hurry up!' which isn't such a bad thing.