You’re in the animal shelter a your heart goes out to a sick kitty that you see staring at you. You decide to take him home. You are really doing this little guy a favor but you could be endangering your other pets.  Make sure that you take appropriate precautions. First, you must make sure that all of your pets are properly vaccinated.  Then when you get home, do not allow the cat to share the same dishes, cat toys or litter boxes. The best thing to do is to keep the sick cat isolated from your other pets. It will not only protect your other animals but will minimize stress for the sick kitty while she heals.  Get the kitty to your vet and ask about how the sickness that your new kitty has may be transmitted. He or she will be able to provide you with any additional precautions.