My Kids got poinon oak-same thing, First, give you dog a bath , if you think that is where it is coming from. As you you, take benadryl and put hyrocortison cream on it, that should work. Poison ivy is a power substance that is released from that plant. If you touch the plant with your hand and then lets say, you scrath your leg-you just spread it to your leg. Do you out in the country?
Karen