Hot spots on a dog, technically known as acute moist dermatitis, are inflamed and infected patches of skin that appear seemingly overnight. These tender, oozing sores are a source of significant discomfort for the animal and a challenge for owners to manage. Understanding what causes hot spots is the critical first step in preventing these painful episodes and ensuring your companion receives the correct care. The condition is rarely a simple issue; rather, it is usually a symptom of an underlying trigger that initiates a cycle of itching and infection.
Primary Triggers: The Itch-Scratch Cycle
The most direct answer to what causes hot spots often lies in the animal's own reaction to an itch. The cycle begins when something irritates the skin, prompting the dog to scratch, lick, or bite the area. This repetitive trauma damages the skin's surface, breaking the protective barrier. Once the skin is compromised, bacteria that are normally present on the surface, such as *Staphylococcus intermedius*, invade the deeper layers. This leads to a rapid infection that creates the characteristic redness, moisture, and intense heat associated with the hotspot.
Parasites and Allergies
Among the most common causes of the initial itch are external parasites. Fleas are the prime offenders, but even a single bite from a flea can trigger an intense allergic reaction in a sensitive dog. Environmental allergies, such as pollen or mold, and food sensitivities also frequently manifest as skin irritation. When these allergens are inhaled or ingested, the body releases histamines, leading to widespread itching. The dog then focuses its efforts on specific zones like the feet, ears, or base of the tail, resulting in the hotspots we see on the surface.
Contributing Physical Factors
Not all causes are related to allergies or bugs. The physical anatomy of certain breeds plays a significant role in the development of hot spots. Dogs with thick undercoats, such as Golden Retrievers or German Shepherds, are particularly susceptible. During shedding seasons, dead hair and moisture can become trapped next to the skin. This creates a warm, damp environment ideal for bacterial growth. Furthermore, dogs with floppy ears are prone to ear infections, which can irritate the neck and ear flap area, leading to scratching and subsequent hot spots.
Behavioral and Health Considerations
Beyond external factors, hot spots are caused by behaviors and health issues that promote moisture retention. Boredom or anxiety can lead to excessive licking, where the constant tongue friction warms and irritates the skin. Dogs suffering from painful conditions such as arthritis might lie in one position for too long, creating pressure sores that become infected. Additionally, underlying health problems like hypothyroidism can compromise the immune system and slow healing, making the skin more vulnerable to the bacteria that cause hot spots.
