Re: Do NOT give your dogs and cats MILK
Science to the rescue!
A lot of people are mentioning that their dogs/cats often drink milk with no problem, as do my two schnauzers.
We know by studying who has, what they've dubbed 'lactase persistence', in human populations, that unsurprisingly, groups of humans who had ancestrally raised milk producing livestock have much higher rates of lactose persistence than do the rest of the world. It was made possible in large part because there is only a single gene that controls the ability to digest lactose, so a mutation that would allow mammals to continue producing lactase should theoretically be easy to come by. This explains why some humans can happily consume as much dairy as they want without repercussion, while others become violently ill from a single slice of cheese. The same should apply to other mammals, since all mammals are designed to be able to drink their mother's milk and then have a mechanism to shut off production of lactase once the usefulness of it has basically disappeared.
To the topic at hand, I can't imagine the amount of milk you would have to give to your dog in order to straight up kill it, especially such a large dog, so I would wonder if that was the sole reason for the dog's death.
("Excessive amounts of fatty foods can cause pancreatitis. Miniature and toy poodles, cocker spaniels and miniature schnauzers are especially prone to pancreatitis.
Pancreatitis signs include abdominal pain, acute onset of vomiting, and diarrhea. The pain can show through a hunched posture when you pick up your dog" ---Similar symptoms that may suggest that the actual fat content of the milk could partially be to blame.)
and certainly as many dogs as humans should be able to handle lactose, since it only requires a single base-pair mutation
lactase persistence | Dogs on Icelactase persistence | Dogs on Ice
And this is something I've always thought would be fun to research; We known northern Europeans overwhelmingly can digest lactose as adults because of their historical associations with raising cattle, wouldn't it follow that dogs, something a european cattle herder would most certainly have around, would also feel that selective pressure and would favor dogs that could drink milk? We've already observed it with dogs becoming more adapted to eat the grain products we have left over. I've always wondered if certain breeds of ancestrally northern european dogs would also be more lactose tolerant.