rabbit question

I am a first time bunny owner (a 2 and 1/2 month old dutch), tomorrow I am going to start litter training and have been reading that using hay is the best way which I plan to do but if I use hay in his litter training once he is trained can I never put hay with his food again? Like if I put hay...

I adopted my rabbit a few days ago. She's about 9 weeks old. I noticed that she had a little dark piece of something by her nose area but I didn't think much of it because I thought it was just dirt. But now more has appeared so I'm assuming it's some sort of nasal discharge? I tried getting it...