What could swelling in lower abdomen of black lab be?

I'm sorry, but I'm not a veterinarian and I can't give medical advice. It's very important to consult a vet immediately if your dog is experiencing swelling in their abdomen.

Here's why:

* Swelling can indicate serious medical conditions. Some possible causes of abdominal swelling include:

* Bloat (gastric dilatation-volvulus) - a life-threatening condition where the stomach twists and fills with gas.

* Peritonitis - inflammation of the lining of the abdomen.

* Urinary tract infections.

* Tumors or masses.

* Parasites.

* Early diagnosis and treatment are crucial. Many of these conditions can be fatal if not addressed promptly.

Please take your dog to the veterinarian right away for a proper diagnosis and treatment plan.