Hugs to you, too.
It's understandable that you don't want to talk to the vet. Know that sometimes these things do happen when it is not necessarily the vet's fault -- especially when the surgery went well, and the dog looked well at the time he was released back to the owner. Castration is not generally considered to be a complicated operation, so almost certainly the procedure was done correctly.
My own veterinarian's dog died a few days after he spayed her, from unexpected complications of the surgery. It was very sad. I believe he is a competent vet (or I would not use him), and I'm sure he paid particular attention to how he did the surgery on his own dog. As I say, sometimes these things just happen. An adverse outcome from surgery is more likely in older dogs and in dogs that are ill, but my vet's dog was young and was perfectly healthy, and she still was lost as a result of spaying.
Again, I am so sorry for your loss.
Thankyou all for your reply...zigi did have cancer in his testicle though it wasnt spreading or not upsetting for him just uncomfortable, my sister kept telling me to take him to the vet...i didnt want to...he had a few years left in him yet...it has been such a shock i never thought i would lose my puppy dog...i wish id never taken him...i cant bring myself to ring the vet as im still so upset and angry...once again i want to thank you all...hugs caroline...
A clot. Okay, yeah, that makes sense. I kept thinking about some type of delayed anaesthesia reaction, but a clot does make more sense. Thank you.
Sounds like he threw a clot which happens frequently after surgery, even minor surgery. I'm sorry.
I am so sorry about your dog. He was obviously very well loved by you and your family.
He might have died from complications from either the anesthetic, or the surgery (or, like skydnsr said, somehow connected to any medical condition he might have had which made the surgery necessary) Did he, for instance, have testicular cancer? Or was this just a regular neutering?
Older dogs are at more risk from surgery. Some sail through it, and others don't. But generally speaking, the older a dog is, the more chance of complications.
As he died only a few hours after the surgery, complications seem likely. And sometimes these happen unexpectedly, and on occasion even a couple of days later...even though the surgery might have gone well, and the vet pleased with the result, and no problems were encountered during surgery or immediate recovery. That is one of those unfortunate and tragic things that cannot be planned for. It just does happen sometimes. And sometimes with younger dogs too.
I really feel for you. This is such a shock, and you must feel very very sad. But I am almost certain it's not because you did anything wrong. And my instinct is he didn't die from dehydration, but from complications from the surgery. The vet would most likely have ensured that he was sufficiently hydrated before he left to go home, and I doubt dehydration would have set in only a little while later, even though it was a hot day.
I am so sorry. I don't know what happened, but if he had water available, I doubt he got dehydrated. And if he had shade available, I doubt he would voluntarily stay in the sun long enough to get a heatstroke. It sounds to me like maybe he collapsed from something related to the surgery, when he just happened to be outside in the sun.
If I understand correctly, he was 13, and you were having him neutered? People don't usually neuter 13 year-old dogs unless there is a medical reason. If, in fact, there was a medical reason for doing the surgery, then whatever illness or condition he had might give a clue.
Also, may I ask what did your vet say about his unexpected death? Usually the veterinarian that did the surgery will have the best idea as to what went wrong.
Again, I am so sorry.