According to the Humane Society of the United States, there are more than 70 million feral and stray cats roaming the streets. Because stray cats often carry dangerous diseases, the best thing that you can do to protect your domesticated cat against serious illness is to keep it indoors. By staying inside, your cat is less likely to fight with other animals and risk the chance of spreading diseases through wounds. You'll also keep it away from infection-spreading parasites, including fleas and ticks, and prevent the kidney failure that can come as a result of ingesting poisonous substances such as antifreeze.
Outdoor cats and those that live in multi-cat homes have the highest risk of disease. However, indoor cats and "only cats" can get sick, too. The good news about cat illnesses is that most are easily preventable; the bad news is that once your cat contracts an illness, it can be very difficult to treat. It's also important to keep in mind that even minor ailments can suggest major health problems. But some cat diseases are more dangerous than others. Read on to learn about some of the most serious ones.