Merciless Medic
Walking Pokemon Dictionary
Given chocolate is just tree nuts produced to make that chocolate taste palatable, yes (especially since milk is in milk chocolate, which is bad in large quantities). Cats and dogs have omnivorous diets. While their diet has changed to include more veggies and fruits, they'll only ever eat berries and grass when they are feeling sick, stressed, anxious, or if they have an upset stomach. If they are given improper foods (like when forced onto a vegan diet), they'll want to eat grass because their body is craving protein from a meaty source and they are not getting that.
Granted, even if the chocolate was poisonous to them, depending on the weight of the dog/cat eating it, they are able to eat a little bit but it will make them beyond sick for a couple days. So it's not great. Its like cyanide to them. While you can survive eating trace amounts of cyanide, don't go eating a spoonful as that will kill you or make you bedridden.
Granted, even if the chocolate was poisonous to them, depending on the weight of the dog/cat eating it, they are able to eat a little bit but it will make them beyond sick for a couple days. So it's not great. Its like cyanide to them. While you can survive eating trace amounts of cyanide, don't go eating a spoonful as that will kill you or make you bedridden.