I get mine from Bunspace and have tried them briefly with Mimzy, who has had early onset arthritis since the age of four and now presents with spondylosis.
They are dosed at four pellets per day, they look and smell just like regular timothy hay pellets and on the whole are an excellent way in ny opinion to get a fussy bun to take a chondroitin supplement. However I can't seem to keep Mimzy interested in them long enough to see consistent positive benefit...plus I fear his disease is progressing too fast for the pellets to have significant effect.
However if you have a bun who is not gaining relief or benefit from pain medications alone I would recommend these pellets because I do believe they have some good to do if taken regularly. I usually broke the daily dose into two separate ones and fed them as 'treats' after meds morning and night.