Yesterday I gave Harry an apple twig and he chewed all the bark off and left the inside. Today I gave him another and he has eaten half of it, bark and the wood. I have some more but I don't know how often I should give him one. I know he can eat some wood and it won't cause him problems, but how much is too much?
Edit to add - his treats (veg, pellets, wood) seem to give him more of an appetite for hay. He always jumps in one of his litterboxes after a treat and has a good munch. So I'm not worried that it will stop him eating hay, I just don't want it to give him digestion problems or make it hard for him to pass stool or anything.