- Myth #1: Cows always produce milk.
- Myth #2: Since organic farmers can't use antibiotics, organic dairy cows aren't treated when they get sick. They keep getting milked, so the reason that organic milk tastes creamier than conventional milk is due to all the extra pus in it from those sick cows.
- Myth #3: Domestic dogs and wolves have identical digestive tracts.
If selective breeding could alter the size of the GI tract, I don't see why there couldn't be a ton of differences we simply can't recognize yet. The important thing to pay attention to is what the selective pressures have been on dogs. Early in domestication, the dogs that could survive on human garbage had a selective advantage. More recently, as diets shifted to kibble, dogs that did best on a kibble-based diet had an advantage. Kibble might only be 50 years old, but when you consider how many canine generations that is, that's a lot of time for breeders to be selecting (intentionally or not) for dogs that do well on kibble. A wolf that can't handle the bacterial load of raw meat simply dies. Dogs haven't had the same selective pressure placed on them- when Winnie had awful diarrhea after my attempt at raw feeding, I just put her back on kibble, no (long-term) harm done.
Anyway, my point is, there's almost no way that the GI tract escaped being altered throughout the many many many years of canine domestication. There's nothing wrong with that, and it addresses the important point that while wolves may be well-equipped to deal with raw meat, our dogs aren't always armed with the same protective mechanisms (that's a long way of saying that yes, dogs can get infected with E. coli and Salmonella- and keep in mind that those pathogens exist primarily in our domesticated livestock, and not as often in freshly-killed prey items in the wild...).
- Myth #4: The life span of pets has been decreasing over recent years due to [insert paranoia of choice here].
The corollary to this is "Pets are developing more cancer today than 10 years ago due to kibble/flea control products/overvaccination/etc." We are seeing more cancer now than ever, but the vast majority is because pets are now getting old enough to develop cancer- and, as pets are moved out of the backyard and into the house (then the bedroom, then the bed...), owners are far more aware of their pets' health. A lipoma that an owner would never have noticed on the backyard dog is now not only noticed on the 'furkid', but called a "cancer", and results in a trip to the vet.