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Hi. Welcome to Just Answer. My name is***** and I've been a veterinarian for 15 years. I'm very, very sorry to hear about your loss. It is extremely hard to lose a patient under anesthesia / due to a surgical procedure. Why did this happen this time when he did so well with his first surgery for the foreign material? Honestly, there is going to not be a definite answer, but my concerns go to his heart. Could there have been some underlying issue there that finally was pushed to far and he succumbed to it? A neuter is a pretty straight forward procedure and there shouldn't be huge complications from it in that short of a time frame to cause a passing. If there was bleeding? Could he have had a bleeding issue such as from getting into rat or mouse poison? These baits can cause bleeding but it takes about 2 to 3 days after getting it to bleed. If this was the case, the incision should have been bleeding a lot and even then, they don't pass that quickly. I wonder if the anesthesia protocol was the same? Could he have had a very bad reaction to something if it was changed? I wish I could say something that would bring him back. My condolences at this time of loss.