Bacterial endocarditis is a bacterial infection of your dog’s heart valves, usually the aortic or mitral valves, as well as the heart’s surface tissue. Bacterial endocarditis is a relatively rare condition, but, if unchecked, it can be fatal. When seen, this condition tends to occur more frequently in large breed dogs, especially German Shepherds.

During the infection’s beginning stages, your dog may not have any visible symptoms. As the infection progresses, though, your dog may appear weak, have a fever, a diminished appetite and a dangerously irregular heartbeat. The bacteria can also spread to other parts of your dog’s body, causing different symptoms that vary depending on which of your dog’s body parts have been impacted.

The bacteria can enter your dog through any external or internal tissue opening. For example, puncture wounds, dental infections, and surgical or invasive medical procedures can create an entry point for the bacteria. Also, immunosuppressive drugs, such as steroids or anticancer medications, can suppress your dog’s ability to prevent bacteria from entering the body and lead to bacterial endocarditis.