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

There are different ways to put it, for example, inside a ball, somewhere he has to think how to get to or even in a feeder. Keep in mind that one of the reasons why rodents don't want to eat it is because they don't like it. In case they try several and still do not eat, go to your veterinarian.