isis answered Thursday January 5 2012, 2:23 pm: Estrus (heat) can last 7-10 days, if she does not become pregnant this will be repeated around every 14-21 days until she does become pregnant. If your cat has already entered this stage you will be fully aware of some of the more unpleasant symptoms. The best way to stop this is to have her spayed as soon as possible. Not only does this mean there will be less unwanted cats around, it stops her being vulnerable to various cancers and transmitted diseases. For every kitten your cat has and you home to friends or family, it's one less in a shelter that will find a loving home. There are a huge number of unwanted cats these days.
She can be spayed whilst in estrus although most vets prefer to catch them between cycles. You may also find that you have 'gentlemen callers' who could spray around your house to stake their claim. Until she is spayed there will be little respite from the symptoms and if you do allow her to have kittens, she can go into estrus whilst she is still nursing, starting the whole thing again.
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