Dog ICU bills

If you know my son Tristan he is a animal lover. His amazing dog , Blue , is 4 yrs old and was totally healthy. He had his annual vaccinations but this time the vet recommended adding the Pro heart 6 , heart worm prevention shot at the same time. He became ill and having liver failure. Seems now we found out its not recommended to combine vaccines and this shot due to this side affect. He is in ICU for the last 3days at MedVet in Mandeville, La. The cost is astronomical and we are asking for a little help . Please donate if your able every little bit helps. The bills near 3500 already . They will be well over 5k