I've never heard of that, but giardia is one heck of a mess, though. we had a litter of newborn kittens bring it into our house, pre-dogs. It was a mess, and our cats and the kittens went through two rounds of treatment to get rid of it, not to mention the tests to figure out what it was (they had me worm them twice even though they weren't showing worms; I had to bring in samples of their poop to test later). I can't imagine it being cheap to treat for anyone, but maybe vet techs get pretty good vet perks, eh?
I'd like to know if it's true, though, b/c if so, I think I'll avoid pig ears. I don't want to go through all of that again (and with two big dogs, no less!).