Hay is a must for your rodent. In your rodent's cage you need to include hay in a variety of ways to get his attention and make sure he eats it.

There are different ways to put it, for example, in a ball, somewhere he has to think about how to get to or even in a feeder. Be aware of their tastes as one of the reasons rodents don't want to eat it is because they don't like it. If they try several and still won't eat, go to your vet.