[anonymously]

As I said before, do you have paperwork signed by a veterinarian that describes whatever treatment the dog received?
Can the veterinarian that gave the treatment be contacted by your current veterinarian to confirm?

Otherwise, a licensed health care professional (for humans or animals) has no choice but to start from the beginning if they cannot confirm prior treatment.
Examine, test, share the results with you and then discuss treatment options.

PS: All effective treatments have risks.