If you want to check out several hundred vegan MD's
(who say by the way that dogs should be vegans and
cats be vegetarian)
go to http;//www.pcrm.org
Yet wild dogs and cats always revert to eating meat. The rabbits attack the garden, not my cats.
Cats require a high protein diet, higher than dogs even. Going to an all vegetable diet would kill the animals.
However, since the site you provided strongly advocates an end to animal testing, how would that group ever figure out that cats and dogs can be vegans?