Pets have been shown to promote relaxation and health, but they can cause medical problems as well. Exotic animals sometimes transmit exotic diseases, a trend that some medical specialists call a serious public health threat. Man's best friend, cat companions and other everyday domestic animals can sometimes make humans sick, too. Many of these zoonotic (meaning transmitted to humans) diseases are rare, and and most are preventable with good hygiene. People with health concerns should consult a doctor.

<<< Click on the pets to learn about some of the diseases they can transmit.

Sources: CDC, Perdue University, Associated Press, Southern California Veterinary Medical Association