Rabbits 500000% need a majority-hay diet. Rabbits need the fiber to keep their sensitive digestion healthy. Also, the hay grinds down their teeth, which never stop growing!
How often and when do you feed him veggies? It could be you’re spacing it so he feels like waiting for veggies rather than eating hay. Rabbits will prefer veggies and pellets over hay, so if they can wait for veggies, they will. Also, if you ‘give in’ and feed veggies when your rabbit is egging for it, this will continue the selective eating behavior. Think of it as getting a child to eat salad. Children won’t eat salad if they get candy every so often– but, if they realize they only get candy once per day, they’ll cave when they’re hungry and eat salad. In this metaphor, salad is hay, and candy is veggies.
The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.