My Huey is 7.5 lbs, and while he is not a viscous chewer, he can be quite the persistant, meticulous destroyer of toys. I got him a kong "squeeky pig" and he loves it.
KONG Squeezz JELS Dog Toy - Dog.com
It bounces erratically, gets slippery and hard for him to hold when all slobbered up, and has a squeeker he has been unable to dismantle in the last two weeks.