My rabbit hasn't eaten since yesterday and there are no droppings in his tray — should I wait until morning?

Take him to a rabbit-experienced or exotics vet now — today, tonight, not in the morning. A rabbit that has stopped eating and stopped passing droppings is in gut stasis: the gut has slowed or stopped, and a rabbit can die from this inside 24 hours. Waiting overnight with a rabbit that isn't eating is the single decision that kills more pet rabbits than anything else.

Stasis is also almost always secondary to something painful — sharp overgrown molar spurs, a gut problem, a bladder stone, or plain stress. He needs a vet to find the cause, not just to restart the gut.

On the way, keep him warm. A rabbit that is crashing goes cold, and cold ears are a bad sign. Bring him in a carrier with familiar bedding, and bring his bonded companion if he has one — separated bonded rabbits can break their bond, and the companion often steadies him. Bag or photograph the last droppings you saw; their size and shape tell your vet a great deal. Write down what he last ate, when, and any recent change of hay or diet.

Do not syringe water or food into a rabbit who isn't swallowing. A weak rabbit inhales it, and pneumonia will kill him faster than the stasis will. Syringe feeding is a technique your vet shows you, with the right food, once they know what is wrong.

Signs worth knowing for the future: hunched with his feet tucked and his eyes half shut, loud tooth grinding, belly pressed into the floor, no droppings or only tiny dry ones. The exam and the imaging decide what is going on here, not a guess from a distance. Go now.