Thank you, thank you, thank you for posting your tip to give cats in heat a bit of a "rub-down". Mojo was very uncomfortable so I got online to look for tips on what to do. Your post was the first that made sense to me and so I gave it a go. I basically just rubbed her belly between the back legs for about 3 minutes or so while she stood on her back legs. I spoke gently to her and let her rest her forelegs on my forearm. She is conked out on the carpet now - resting sound asleep. No more howling or crying. I feel so much better now that she's more comfortable. Great tip!