Yes, cats come into heat whenever. And no, Dr. Lee won't spay while a cat is in heat. When I first rescued Yodie Yodie, she was to have surgery to have the ear polyp removed and be spayed at the same time but she came into heat and he wouldn't do it. I want to schedule Cgirl for spaying again but now I have to take Pigeon in for her teeth cleaning and to have mats removed from her belly. Sweet girl is 17 now and although she's got the sweetest temperament, when you try to groom her, she bites. She just doesn't want to be messed with. She has such a long coat that usually I have to sit on her (kinda) and cut the mats out. But I can't do it on her belly. So while she's sedated for the teeth cleaning, they're going to shave her belly. THEN, as long as none of the fur posse gets sick, Creamsicle will go in to be spayed. Boy, can that girl hit some high notes!