Halitosis in Dogs

Halitosis is the medical term used to describe an offensive odor that comes from the mouth, producing bad breath. A number of causes may be responsible for this condition, notably periodontal disease, a disease resulting from bacteria in the mouth. Bacteria is also associated with plaque and cavities. 

Small animal breeds and brachycephalic breeds (characterized by their short-nosed, flat-faced features; e.g., the Pug, Boston Terrier, Pekingese) are the most prone to periodontal and other mouth diseases, in large part because their teeth are close together.

Symptoms and Types

In most cases, there are no other symptoms aside from a bad odor emanating from the mouth. If the cause of the odor is a disease of the mouth, other symptoms may become apparent, including pawing at the mouth, inability to eat (anorexia), loose teeth, and excessive drooling, which may or may not have traces of blood.

Causes

A variety of conditions may lead to halitosis, including metabolic disorders such as diabetes mellitus (commonly known as sugar diabetes); respiratory problems such as inflammation of the nose or nasal passages (rhinitis); inflammation of the sinuses (sinusitis); and gastrointestinal problems, such as enlargement of the esophageal tube, the main channel that leads from the throat to the stomach.

Other possible causes of halitosis might be traced to a trauma, like that of an electric cord injury. Viral, bacterial or fungal infections can cause foul odors to emit from within the body, and dietary problems can play a role in the emission of odor as well. For example, if your dog has been eating offensive foods, or is exhibiting a behavior called coprophagia, where it is eating feces, your dog will have correlating foul breath.

Further possibilities are pharyngitis, an inflammation of the throat or pharynx, and tonsillitis, an inflammation of the tonsils. The presence of cancer, or the presence of foreign bodies may also result in disease of the mouth and accompanying bad breath. But, the most notable cause of halitosis is a disease of the mouth such as periodontal disease, which is due to plaque bacteria buildup.