I can certainly relate a bit to your problem!! First off, yes, I do think that Toby's biting does have to do with his being declawed. The first line of defense for a cat is their claws, and since he doesn't have any, he must use the second line, his teeth. Also, some cats do nibble as a sign of affection, so that might be it. I would reccommend that you watch for warning signs before Toby bites, such as twitching of the tail, ears back, hair up. He might be getting over stimulated if he does this while you are petting him.

When I first got my kitty Jonah, he would often bite me as I was petting him, or sometimes he would just run to me, bite down on my arm, then run off. After I added Finn to the household, he stopped biting me...but...he started beating up on Finn. Over the 6 months that Jonah and Finn have been together, they've gotten along remarkably better, they used to have nasty fights several times a day, now it's once a day or every other day. I spray them with water (the first time, I broke up the fight myself, and in the process, got myself really scratched), and then I'll usually give Jonah a "time out" if I can. (I'll leave him separated in my room). That seems to help. Also, you could try a herbal supplement called "rescue remedy". It helps to calm some cats down and can be added to their water.

I would also highly reccommend reading Pam Johnson Bennett's book "Think Like a Cat". It's a GREAT resource for all kinds of cat problems!!

Good luck with your crew!!