Which of the following is a common sign of leptospirosis in dogs?

Vomiting is a common sign of leptospirosis in dogs, which is a bacterial infection caused by the Leptospira species. This illness can lead to a variety of systemic symptoms, and gastrointestinal upset is frequently observed. When the kidneys and liver are affected, as they often are with leptospirosis, symptoms like vomiting become apparent.

In contrast, excessive whining, excessive barking, and panting are less specific signs and could indicate a range of conditions, from stress and anxiety to other medical issues not limited to leptospirosis. While these behaviors are concerning, they don’t directly correlate with the symptoms commonly associated with leptospirosis. Recognizing vomiting as a key sign helps in the early detection and treatment of this potentially serious condition.