What can I do for soften the dog pain?

Your established vet will see your dog as an emergency. You can also apply for Credit Care, there would be an application in your vet's office. If you aren't willing to have your dog seen as an emergency, you need to surrender the poor dog to a shelter/rescue, or if stated in the breeder's contract, you must return the dog to them. To not get your dog vet care is considered to be animal abuse.