So sorry you're having to go thru this heartwrenching ordeal. The decision to PTS is never easy, especially when you are trying to ensure your beloved pet is pain free.

As others have suggested I agree with a second opinion from your own vet. My RB girl Sami saw the substitute vet for her agravated feet, was told she had foot cancer. In 3 feet???!!! Saw my regular vet when he was back from vacation. Turned out she had food allergies and had a skin infection.

Prayers that you can be strong and get thru this, regardless.