Which of the following symptoms may indicate ear infections in pets?

Head shaking is a common symptom that may indicate ear infections in pets. When a pet has an ear infection, they often experience discomfort and irritation in the ear canal, which can lead them to shake their head in an attempt to alleviate that discomfort. This behavior is a natural response to the pain or itching caused by the infection and may be accompanied by other signs, such as scratching at the ears, a foul odor from the ear, or redness and swelling in the ear area.

In contrast, excessive shedding, frequent barking, and increased appetite do not specifically correlate with ear infections. Excessive shedding can occur for various reasons, including seasonal changes or skin conditions, frequent barking may indicate excitement, anxiety, or behavioral issues, and increased appetite can be tied to several factors, including stress or health conditions unrelated to ear issues. Thus, head shaking stands out as a direct and common indicator of ear problems in pets.