Holy crackers, no kidding--and you must have the healthiest pooches on the block ;0). Cavies are pricey; just out of curiosity is there a reason you feed them instead of rabbit? I bet the meat is fattier, for one thing.
My dogs don't rob too much from the garden, though they'll strip the plums off the tree if I don't keep an eye on them. They'll also pluck blackberries out of the hedge. I can't say that I've ever seen them eat veggies on purpose, though. They'll definitely take a single green bean as a treat, but even sweet veggies like carrots they mostly just shred if they have a whole one to mess around with. They'll eat grass but only if dinner's late or it's a fast day. As far as I can tell mostly they're going for the sweet stuff.
I'll have to try them on seaweed--it'd be nice to have something handy besides freeze-dried liver for random treat events ;0)
“Falconry is not a hobby or an amusement; it is a rage. You eat and drink it, sleep it and think it. You tremble to write of it, even in recollection. It is as King James the First remarked, an extreme stirrer up of passions.” --T.H. White, The Godstone and the Blackymor
"The world must be all fucked up when men travel first class and literature goes as freight."
- Gabriel Garcia Marquez, One Hundred Years of Solitude