Veggie supplements

Does any body know anything about vegetarian glucosamine for dogs?

My dog can not have the ordinary stuff due to a shellfish intolerance. I want to give her some nutritional support for her hips and knees as she has had a problem in the past.

I would like to know if it is effective, and which is the best brand, and where I might be able to get it from. I really would appreciate any comments and experiences other readers have had with vegetarian glucosamine.
 
Thanks,

Lesley Noke, by email