HI there - you can call the vet - do it at lunch if you can. (better you should call sooner than 5 to get an appointment for tomorrow).
All you have to say is that you have a bunny that's a bit sick - her poo looks funny and she's been tired a lot. Tell them you want to make an appointment for you and your mom to bring her in TODAY(if you can) or TOMORROW because she has been having the wierd poo fora few days now.
Thelady that answers the phone is really nice. She will ask you the name of the bunny. Your name, how old the bunny is. She might ask you some questions about the bunny's poo so she can tell if the problem is urgent.
Do you know what time your mom and dad can take you there today or tomorrow? Tell her you can only come in after 5pm or whatever time your parents can drive you over, but tell her you really need to come in because you think the bunny is getting more sick.
If you can call your mom or dad and find out what time they can take the bunny today or tomorrow, then you can call the vet. I think your mom will be impressed that you are taking such good care of your bunny.
It's not too scary - and she won't ask you anything you don't know. If she does, just tell her you don't know, but you can ask your mom to call back.
That's it.
Also - you should really tell you mom how sick the bunny is if you haven't already. Tell her it's really realy urgent that you take her in because your bunny can die from the problems she is having.
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Nadia