A dog tick is a small, blood-feeding parasite that primarily affects dogs but can also bite humans and other animals. These ticks are typically found in grassy or wooded areas and attach themselves to their hosts to feed. They can transmit various diseases, including Lyme disease and Rocky Mountain spotted fever, making them a concern for pet owners. Dog ticks have a flat, oval shape and can vary in color, often appearing brown or black. They can grow larger after feeding, becoming engorged and easier to spot. Regular checks and preventive treatments are essential for keeping pets safe from these pests.