I hope you will listen to the vet that examined and diagnosed your dog. Bladder stones are a potentially life threatening condition. A blocked urethra can result in emergency surgery.
Calcium oxalate stones don’t just go away. They won’t know for sure what type of stones he has till they get them out of there and analyze them.
In my opinion the vet is focused on trying to help the dog and prevent more pain and infection.
PS: They can have more than one type of stone, my dog had struvite and calcium oxalate, struvite cleared up with antibiotics but the calcium oxalates required surgery.
