Here are some things to consider:
* Type of wood: Make sure the wood is safe for guinea pigs. Some woods are toxic, so do your research.
* Size and shape: The wood should be large enough that your guinea pig can't swallow it. Avoid sharp edges or splinters.
* Placement: Make sure the wood is securely placed so it won't fall over and injure your guinea pig.
If you are concerned about your guinea pig's chewing, it's always best to consult with a veterinarian. They can help you determine if your guinea pig is chewing on the wood correctly and if there are any underlying health issues.