I know it isn't much comfort, but if it is a shunt, the symptoms probably would have appeared sooner than later even if you hadn't attempted the neuter. You were trying to do what is best for your dog by having him neutered, so try not to beat yourself up over that decision!
Bloodwork really should have been done before the surgery-- I'm one of the people who very strongly thinks that vets should require bloodwork every time a pet is put under anesthesia. I think a lot of vets fear making it mandatory because they will lose clients to the cheap neutering clinics if they don't give people a choice, but that doesn't justify less than thorough care. Even animals that have zero clinical signs of illness can have issues that just haven't surfaced yet, and owners cannot be expected to understand that possibility and the importance of the bloodwork if they are not properly educated by the vet or his staff.
Keeping Toby in my thoughts today. I really hope that he gets better for you.
__________________ Penny: Bane of Moles! Terror Among Terriers! Really Gosh Darn Cute!
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