Dog Eating Stick. It is one of their instincts to chew so they can keep their gums and teeth healthy. The sharp edges of eating sticks can also interfere with teeth, intestine, or mouth.
Eating sticks is not something which a dog should be doing and it could cause harm by hurting their gastrointestinal system. Namely, the reason why dogs must not eat wood sticks is because wood sticks are prone to splintering and the splinters can potentially cause significant damage. Why does my dog keep eating sticks?