Median income is the amount which divides the income distribution into two equal groups, half having income above that amount, and half having income below that amount. Mean income (average) is the amount obtained by dividing the total aggregate income of a group by the number of units in that group. The means and medians for households and families are based on all households and families. Means and medians for people are based on people 15 years old and over with income.
Any ingestion of chocolate is bad for a dog; whether it eats a toxic dose, your dog could suffer some serious adverse reactions. Since even a small dose of theobromine is potentially toxic and possibly lethal for dogs, it is recommended that you contact your veterinarian immediately for advice.
It is not that hard for a dog to get into something like an Easter basket full of chocolate eggs and bunnies and gobble up a pound or two of chocolate. If the dog is small, that could be deadly. It turns out that chocolate poisoning is actually not as unusual as it sounds. For a human being, caffeine is toxic at levels of 150 milligrams per kilogram of body weight (see this page). That's the same as for dogs! Humans generally weigh a lot more than dogs, but small children can get into trouble with caffeine or chocolate if they consume too much of it.