One of the things that many cat owners love about their pets is their inquisitive nature. It is also one of the main reasons that cats end up lost, as they investigate the world around them. Sadly, pet theft is also a problem, particularly with rare or expensive breeds. Sometimes life events like moving house can cause cats to become confused enough that they get lost, and struggle to find their way home.
Cats can also have a habit of visiting multiple households. This can become confusing, and does sometimes result in an owned cat being ‘adopted’ by a well-meaning family. Friendly stray cats may also just be lost, and can also be absorbed into a new household. A microchip provides a way to ascertain if a cat is truly a stray or merely lost, and can also be the only way to prove ownership if there is any dispute.
Tags, while useful so long as they are on safety collars, are not a guaranteed method of identification, as they can easily be lost or replaced.