10. Lyme Disease
Lyme disease, so called because it was originally discovered in Old Lyme, CT, is one of the most common tick-transmitted diseases in the world. It is caused by the bacterium Borrelia burgdorferi and is frequently brought indoors by our pets, unbeknownst to them. Clinical signs of Lyme disease include red, expanding rash, fatigue, chills, fever, joint aches, and swollen lymph nodes. If left untreated, it can lead to facial palsy, heart palpitations, and even meningitis.