Veg’n Dog Health Survey
This survey is more informative than conclusive, mainly because it doesn’t compare dogs on a vegan or vegetarian diet against dogs on a typical meat-based diet. But it’s interesting to see what the results are, and how people responded at the end.
In general, it was found that a vegan diet was healthiest, with two possible drawbacks that can be overcome with supplements. (But again, there is no way to know how the frequency of those conditions might compare with the rest of the dog population.)
You can download this .pdf file to read it: Dog Health Survey
(Also, there might be other causes for arthritis, regardless of dietary choice. I found this article earlier this week: “Are We Overvaccinating Our Pets?”.)
More info on veg’n diets for dogs:
http://www.vegetariandogs.com