Mallack said: 90 is really low for an Adult Female, I'm leaning more towards 110lb (~50kg). Even then, it only expands how much she can eat without toxicity.
Not really. Having bakers' chocolate around is unusual in the average household. And I used 90 under the assumption that Touhous were petite beyond measure, and I might get a sheet party if I went too high.
Still, .3 to 1 ounce per pound of body weight isn't much of a threat for the average dog. Not good, but not oh-god-lethal.