Hi, thank you for filling them in!

I'm looking at the impact that the type of concentrate feed (muesli or nuggets)rabbits and guinea pigs eat has on their dental and digestive health.
This is going to be a tricky thing to analyse.
Not all dental issues are caused by poor diet, as there is also a strong hereditary element.
I've filled the survey in for one of ours - 12 more to go; but the answers may be misleading, as so many are rescues, who came to us in poor condition (diet unknown in most cases). So, whilst they are mostly on a high quality hay plus a few Science Selective pellets, the majority of them are sadly dental bunnies (plus other problems).
Two were fosters, now permanent, and came to us in a group of five very young things, when their mother died, having been stupidly bred back to back. They had been given goat's milk, and are even now prone to dodgy stomaches. Therefore, in addition to their fresh hay, they are fed pro Fibre pellets daily (and lifelong).
So, we adjust each rabbit's diet to suit their health, as needed.
We did have a rabbit who became "allergic" to hay (or the spores and dust in it) which badly affected his airway.

That was very tricky. For him, we grew our garden grass long, and also grew tub after tub of wheat grass. Interestingly, he never needed another dental after he switched from hay (good quality) to grass. Just as well, as he had other problems too.
We currently have a rabbit, again with other health problems, who can only have hay from the Dust Free Hay Company.
I suppose that what I am trying to say, just very badly, is that a suitably adjusted diet can improve the health of a rabbit, even though it was fed an exemplary (high quality) hay/ minimal pellet diet previously.
It could be that our motley crew would distort the results of your survey, so I won't be offended if you don't want me to do any more.