TL;DR: Soft, movable lumps on dogs are usually benign lipomas, but all new growths should be evaluated by a veterinarian to rule out serious conditions. While rarely an emergency, providing photos helps your vet track changes and determine if a biopsy is necessary.
What are the soft, movable fatty lumps on my dog's skin?
In many cases, soft and movable lumps found under a dog's skin are identified as lipomas. Lipomas are benign, non-cancerous tumors composed of mature fat cells. While they can appear as a single mass, many dogs develop multiple lipomas across their chest, abdomen, and limbs as they reach middle to senior age.
Are these fatty lumps a veterinary emergency?
- The urgency level for multiple fatty lumps is generally low because lipomas are typically slow-growing and non-invasive.
- They do not require immediate emergency intervention.
- It is important to have any new growth evaluated by a veterinarian during a routine appointment to rule out more serious conditions, such as mast cell tumors or sarcomas, which can mimic the feel of a fatty mass.
How does providing a photo of the lumps help with the triage process?
- A high-quality photo or video provides a vital visual record for the veterinary team.
- It allows the vet to assess the location, approximate size, and skin condition surrounding the mass.
- Comparing photos over time helps track growth rates.
- Visual documentation is crucial for determining whether a biopsy or surgical removal is necessary.
Clinical Context (Merck Veterinary Manual)
Lipomas are common benign tumors in dogs, occasionally seen in cats and horses, and rarely in other domestic species. In dogs, they typically develop in older, obese females, most commonly on the trunk and proximal limbs, with Doberman Pinschers, Labrador Retrievers, Miniature Schnauzers, and mixed-breed dogs being at higher risk; in dogs and cats, multiple lipomas occur in greater than 5% of cases. While benign, lipomas should be monitored as they enlarge over time and can be indistinguishable from infiltrative lipomas or liposarcomas; excision is generally curative, and dietary restriction before surgery may improve tumor margin definition. Infiltrative lipomas are rare in dogs and even less common in cats and horses, typically occurring in middle-aged females on the thorax and limbs; breeds at risk are similar to those for lipomas, but these tumors are considered sarcomas of intermediate malignancy, necessitating aggressive excision or amputation. Liposarcomas are rare neoplasms, mostly recognized in older male dogs, particularly on the trunk and extremities, with Shetland Sheepdogs and Beagles potentially predisposed.
Chapter: Oncology
Source: The Merck Veterinary Manual, 11th Edition (Page 958)