Ear infections in dogs can be uncomfortable and painful, and recognizing the signs early is crucial for prompt treatment. One common indicator is excessive scratching or pawing at the ears. Dogs may also rub their ears against furniture or the ground in an attempt to alleviate the discomfort. Additionally, if you notice your dog shaking or tilting their head frequently, it may be a sign of an ear infection. Dogs with ear infections often display sensitivity to touch around the ears and may yelp when the area is handled. Another telltale sign is the presence of a foul odor emanating from the ears. Karen A. Moriello, a DVM from the University of Wisconsin-Madison states that ear infections in dogs can produce a distinct, unpleasant smell. This is due to the accumulation of bacteria, yeast, or pus. Discharge from the ears, which may be brown, yellow, or bloody, is another indicator. In some cases, the ear canal may appear red, swollen, or have a waxy buildup. Changes in behavior, such as increased irritability or a reluctance to have the head touched, can also suggest an ear infection.References:https://www.msdvetmanual.com/dog-owners/ear-disorders-of-dogs/ear-infections-and-otitis-externa-in-dogs