My Zeus loves wood of any kind...sticks from the pine tree, wood blocks, pine cones, etc. I'm constantly taking these things away from him and he has every known chew toy to mankind!:)
Thankfully, though, he doesn't seem the worse for wear from chewing on all of these various things...
We're removing an oleander bush, however, from our backyard because we caught him trying to pull a branch off of it!
We found it before he could actually gnaw on it but it scared the $#@% out of us anyway. This bush is huge and is going to be a big job but it has to be done in order to protect my "Woodweiler"!:D