For the last time, people, male dogs don't go into heat (lol biology!fail)

I was browsing through the excellent and amazing Appendix to the Handbook of the Marvel Universe and reading the profile for Jack Russell, Werewolf By Night. Down towards the bottom, it's mentioned that in Astonishing Tales: One-Shot (Boom Boom and Elsa) #1, a digital comic, that Jack once dated Elsa Bloodstone, but they broke up, quote: "since she was synched up with the lunar cycle, he was always in heat when she wasn't into it."

It seems the writer of this comic made the same mistake as about a billion Inuyasha fanfic writers, which is assuming that male dogs (or lupines, or werewolves) go into "heat", which they don't. Only females do -- it means they're fertile and receptive to being impregnated. The only way that Jack would go into heat is if his werewolf form is female, which I guess is possible considering his transformation is magical.