The dangers of ticks
Ticks can also cause medical problems for your dog because they can transmit serious diseases such as Lyme disease, Ehrlichiosis and Rocky Mountain spotted fever.
Signs of a tick bite on your dog include fever, loss of appetite, sore and swollen limbs, skin infections, lethargy, and arthritis. Both ticks and fleas can cause Anemia (low blood count) in a dog from losing too much blood.
For more on ticks, check out this Dog Tick Guide