Hi
New here. Looking for some input. I adopted a 14 week old Netherland Dwarf bunny last Wednesday. Picked her up and was told she was in perfect health. Brought her home as she’s a in door bunny and lives in my room away from my dogs etc, let her settle in and she was eating, drinking, pooping and playing fine with and rest of the family members, wasn’t nervous at all. Today, Sunday morning, went to feed her and found her laid out, lethargic and lots of diarrhoea 
Having previous experience with rabbits, I know Diarrhoea isn’t a good thing so rushed her to the out of hours at my vets, they checked her over and said she was very dehydrated and kept her in and put her on IV for fluids and antibiotics also. I called mid day to see how she was and said she had another bad bought of the runs. Called again at 6:30PM and said its slowly slowing down but she isn’t eating still.
She has Timothy hay at all times, 20-30 grams of excel rabbit pellets and been trying to introduce greens to her diet which she won’t entertain at the minute. But since she’s away from other animals and my hands are always clean before handling her, vet suspects right now she’s picked something up while at the shelter. She was booked in for her vaccinations on Monday too! Which has been put back until she’s better.
I called the shelter and they said they would pay the vet bill. Why are they paying? Something that didn’t tell me maybe?
Been upset all day worried she was going to die and felt like “what if I did something wrong?” 