The Rabbit needs food going in to keep stool coming out. When a Rabbit stops eating and drinking this can lead to a GI Stasis which means the gut stops working. When this happenes it can kill a Rabbit.
GI Stasis can be a result of stess due to his owners not being around, so keeping a close eye on him passing stool is most important.
Make sure he has plenty of grass hay and try promoting it becuse the fiber in the hay keeps the gut going. The pellets should be aboout 1/8 of cup and about 1/4 cup of fresh veggies.. It is a good thing he is tanking the veggies.
If he completely stops eating, then grind his pelltesand mix qith water andfeed via syringe. YOu can also do an abdominal massage to hel the gut action and to break up gas.
If you find he will not eat anything, drink and is not passing stool, then at that poind have him seen by a Vet to get some gut motility medication, a probiotic and an Antibiotic.
Please reply to discuss this information. The big issue is to make sure he is passing stool.
Please reply so we can discuss this information and questions.