Unfortunately she is not microchipped. Hopefully she will be neutered if not neutered yet. Free Cat Neutering
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Animal Rescue charities like The Scratching Post recommend that it's vital for cats to be neutered and microchipped. Adult cats enjoy catflap access to a back garden - and they need catflap access to get back inside their home. They advise locking the catflap at night so that cats are safe inside at night as it reduces the risk of them getting lost or injured. Remember not to let them out the front door by mistake.