A hay-only diet wouldn’t get rid of the problem in just four days, it would take longer for a healthy gut flora to establish itself. That can take months. Seeing that she’s so very young, I don’t know if a hay-only diet going on for months is the best thing (but I’m definitely not a vet). I’m wondering if she could have some kind of parasite? I think you should check back with the vet that gave you the advice about the hay.

This happened to our little baby Sukka when we brought her home! We put her on a hay-water diet, and it took about a week or so, but it definitely helped. Her poops still haven’t entirely normalized, however, and we’re currently looking at a megacolon diagnosis after a bout of coccidia meds didn’t fix her up.

If your bunny is still eating and drinking and seems otherwise healthy, I’d keep her on the hay-water diet for a few more days before calling up the vet again. It took about a week for Sukka’s poops to stop being stinky piles of smush. If she stops eating and drinking or seems lethargic or not like herself at all, though, please call the vet immediately! Coccidia is very common in young rabbits, and can cause symptoms like what you’re describing – coccidia can also be fatal if not treated!

As for bam’s concerns about the hay-water diet being healthy, I voiced those exact concerns to our vet when we decided to continue Sukka’s hay-water treatment for at least the course of her coccidia meds. According to our vet (who is rabbit-savvy!), provided the hay is good quality, the rabbit shouldn’t suffer any ill effects from a hay-water diet even if they are young, since that’s what the majority of their natural diet would consist of anyway.

Since you have another healthy rabbit, you can use poops from your healthy rabbit as probiotics for the new one.

Yay! Great news =) Thank you for updating!