TL;DR: Flank sucking is a compulsive behavior common in Doberman Pinschers that can lead to skin infections and requires veterinary attention within 24 to 48 hours if the skin is damaged.
What is flank sucking in dogs and why does it happen?
Flank sucking is a repetitive behavior where a dog grasps a fold of skin in the flank area—the side of the body between the ribs and the hind leg—and sucks or nibbles on it. This behavior is most commonly seen in Doberman Pinschers, suggesting a genetic component, and is classified as a Canine Compulsive Disorder (CCD). It is often rooted in anxiety, stress, or a lack of environmental stimulation.
Is my dog’s flank sucking considered a veterinary emergency?
- Obsessive flank sucking is considered a Medium urgency level; while rarely a life-threatening emergency, it requires medical attention to prevent complications.
- Persistent sucking can lead to significant skin irritation, hair loss, and secondary bacterial infections.
- Seek veterinary care within 24 to 48 hours if you notice broken skin, bleeding, or signs of infection such as pus or extreme redness.
How do photos or videos of the behavior help a veterinarian with triage?
- Capture a photo of the affected skin so the vet can see the extent of physical trauma to the tissue.
- Record a video of the behavior in action, as dogs often stop compulsive behaviors when they are in a high-stress clinic environment.
- Provide this visual evidence to help your vet assess the intensity of the compulsion and ensure a more accurate diagnosis and treatment plan.
Clinical Context (Merck Veterinary Manual)
Flank sucking in dogs, particularly Doberman Pinschers, may originate as a displacement behavior due to frustration, conflict, or high arousal. Initiating factors can include unpredictable routines, environmental changes, and chronic anxiety. As the behavior increases in frequency or intensity, it may become compulsive, interfering with normal function or becoming independent of the initial stimulus, potentially involving altered serotonin transmission. Diagnosis involves observing and documenting the behavior, with video recordings if needed, while also considering the breed and age of onset due to a likely genetic component in many compulsive disorders. Medical problems causing similar signs, such as neuropathic pain or pruritus, must be ruled out.
Chapter: Behavioral Medicine
Source: The Merck Veterinary Manual, 11th Edition (Page 1561)