Outside cats cannot effectively be contained by either electronic or traditional fences unless the yard has a net or fence ceiling. Outside cats are essentially free-roaming creatures. They can scale fences and run free. This means that cats that roam or are visited by other roaming cats have an increased exposure to parasites and infectious diseases. Some of these diseases, such as feline immunodeficiency virus (FIV) and feline leukemia virus (FeLV) can be life threatening.
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Car-related injuries also shorten the lives of many free-roaming outside cats. Add to that the possibility of the infamous cat fight and you have plenty of reasons to keep your cat indoors.
Pic of the Day: My neighbors complained that its too cold for my dog to be outside all day during the winter. I sent them this.