7. LYME DISEASE
Illness: Lyme disease is caused by a bacteria most commonly spread by a type of tick called the deer tick.
Symptoms: Lethargy, limping, swollen joints, decreased appetite, weight loss
Who's Affected & Why: Lyme disease is not as common in the west or south because ticks prefer to feed on lizards rather than mice in these areas. The disease is most common along the northeastern seaboard and in the upper midwest.
How to Prevent & Cope: The most effective way to prevent Lyme disease, as well as other tick-borne illnesses, is to put your dog on a flea and tick preventative. (Dogster)