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Hello, this is Dr. Jess. I am very sorry that no one has gotten to your question yet. Are you still online?
Just in case you come back online here, with the limited information I have, I would recommend taking your dog into the emergency vet now.
In any dog with an abdomen that is enlarging and the dog is becoming weak/unable to stand I would consider an emergency situation. There are numerous things that can cause enlargement of the abdomen. These could include bloat (where the stomach fills with gas and twists on itself), bleeding into the abdomen from a tumor, fluid build up in the abdomen as a result of cardiac disease or liver disease or another disease causing low protein levels in the body. All of these situations could become an emergency if your dog is worsening, so urgent care would be recommended.