A puppy died? A sweet little puppy? How devastating! Sorry to be a real boob, but I'm in tears, now....
Was he a Cavalier King Charles puppy? I ask because many of that breed are known for having problems with their brains and spinal systems which cause severe pain. I wonder if it could also make them more delicate and inclined to injury or death?
Here's a quote from a website on the breed:
"Syringomyelia (SM) is reported to be "very widespread" in the cavalier King Charles spaniel breed. Syringomyelia is a disorder of the brain and spinal cord, which may cause severe head and neck pain and possible paralysis."
Whatever the cause, it's heartbreaking. RIP, little one :*(.