When a female dog is "ripe" for mating with a male dog. This term is also applied to humans when a female is horny she may be considered "in heat"
Guy 1: "That girl practically ripped your clothes off at the bar!"
Guy 2: "I dont know what to say man, she was like a dog in heat!"
Guy 2: "I dont know what to say man, she was like a dog in heat!"
by IlikedoubleD's May 4, 2009
Get the Dog in heatmug.