We always used butter to introduce animals to each other. A copious amount on the face, and rear end. then everyone smells the same (tastes the same, too) I've never had issues with front hand declawing...if kitty gets outside, she can still climb trees. Oh yeah, for the best, odorless litter...garden soil. When we had 6 (house!) cats, we used soil, and had nary an odor