In May I adopted 2 year old sisters. The mother of the woman who had the cats (the daughter was moving back home and Mom wanted the rehoming) said she was told the cats were spayed. The daughter told me the same thing when I went to pick up the cats. Both girls have been to the vet since to get their shots, and the vet said she couldn't tell if they had actually been spayed. She didn't see a noticiable scar and told me if indeed they weren't that they would go into heat and act strange. Sure enough Fera was wild last night. She's usually not my problem cat in the evening but last night she was jumping on the bedroom table and meowing out the window like crazy, jumped all over the bed, fought with the male cats, and was trying to get out when I got home last night and when I left this morning. She sat in the living room part of the night just meowing loudly. Thankfully my two boys are indeed fixed and show no interest. If she's not actually spayed (or spayed correctly) I'll find a way to come up with the money to have it done. Is this a heat cycle?