Dog Soft Movable Lump on Ribcage: Causes and Next Steps

TL;DR: A soft, movable lump over a dog's ribcage is often a benign fatty tumor, but you should schedule a non-emergency veterinary appointment for a definitive diagnosis. Monitor the growth for any rapid changes in size, color, or discomfort.

What is this soft, movable lump on my dog's ribcage?

• Finding a new growth can be worrying, but soft, movable lumps over the ribcage are common, especially as dogs age.
• Most frequently, these masses are lipomas, which are benign (non-cancerous) fatty tumors that feel like a squishy balloon under the skin.
• Other possibilities include sebaceous cysts or fluid-filled pockets, which can only be confirmed through a physical examination.

Is a soft, movable lump on my dog considered a medical emergency?

• The urgency level for a soft, movable lump is generally Low and is not an immediate life-threatening emergency.
• Schedule a non-emergency appointment with your veterinarian to have the mass aspirated (a simple needle test to collect cells).
• Move your appointment to an earlier date if you notice the lump growing rapidly, becoming red, appearing painful, or causing your dog to limp.

How does taking a photo of my dog's lump help with veterinary triage?

• Taking a clear photo provides a vital baseline that helps your veterinary team track if the mass is growing over time.
• Place a common object like a coin or a ruler next to the lump in the photo to create an accurate size reference.
• Capture the color and texture of the skin to document any irritation or changes.
• Share these images during a tele-triage session or at your in-person check-up to provide an accurate history of the growth.