White chocolate is the least toxic to dogs and according to this link would take "250 pounds of white chocolate to cause signs of poisoning in a 20-pound dog" as opposed to "one pound of milk chocolate in a 20-pound dog"
http://petcaretips.net/chocolate-poisoning-dog.htmlTheobromine content,
white chocolate - 1 mg per ounce
milk chocolate - 60 mg per ounce
baking chocolate - 450 mg per ounce
So it's "relatively" safe but like you, I think it's wrong to advertise that it's OK to give it to dogs. :( Some people wont discriminate between white and dark chocolate and think it's all OK. It's also encouraging dogs to get a taste for it so they may seek out chocolate and help themselves!
Kath.
Edit: you just beat me Shadowboxer :D