Some of the most common dangers for outside cats include:
Vehicles - An outside cat darting across the street is a perfect target for a moving vehicle, and cats that are hit by cars rarely survive.
Unfriendly dogs - Dogs can inflict life-threatening injuries on cats, especially those who have learned to be trusting towards dogs.
Predators such as coyotes and raccoons - In many areas, wild animals are also potential predators.
Other cats - If your cat gets into a territorial fight with another cat and gets bitten, it could result in the spread of disease or a painful abscess, with a need for veterinary care. Always check your cat for painful lumps and bumps.
Injury or cruelty - Not all people love cats. Cats have been known to have been injured by angry neighbors who dislike cats digging in their gardens or hunting birds.
Diseases - Contact with wild animals and other cats can result in the transmission of life-threatening diseases such as feline leukemia or feline immunodeficiency virus.
Parasites - The risk of infestations with fleas, ticks, intestinal worms, and other parasites increases in outdoor cats.
Poisons - Although you may have "cat-proofed" your outdoor area, others may not have, and your cat could be exposed to toxic substances such as antifreeze or pesticides.
Harsh weather: Weather conditions can change abruptly, and your cat could experience frostbite in the winter or dehydration in the summer.
Getting lost: Your cat could be shut into a building, stolen, taken to an animal shelter, or adopted by others. Many cities have laws against stray animals, including cats. Make sure you keep identification on your cat at all times.