Sergeant my therapy dog

A mass appeared on Sergeants right leg and the rest of it swelled up. I brought him into the vet.  I did not have the money for treatment. I am low income. All I could afford was the medicine  Carprofen, which when he was on it reduced the swelling in his leg except for the mass. All the money raised will go for blood work, biopsy of mass, and hopefully enough to have mass removed. Sooner I can get the money, the sooner I can get him treated. Sergeant has emotionally supported me through hard times for 13 years. Seeing him suffer and not knowing why is difficult. Receiving the help to get him treated will put everyone in our family at ease.