Not really "heat" but they dogs do like to hump...for mating, for pleasure, for dominance, out of boredom, for fun???? My spayed female Jack Russell loves to hump certain stuffed animals. It is sort of funny. She does not do just any stuffed animal. Occasionally one will take her eye and that toy will get no mercy. But if I put it away, she stops the behavior until another happens to catch her interest. My girl's no tramp, she's selective.
