my dog suddenly died

[timesrt4]

Hello,  I have a male blue pit bull who was about 2 and 1/2 years old.  He was a very healthy dog who followed me everywhere around the yard.  Today it was hot out in the 90's and he stayed under the porch all day even when i was outside he wouldnt come out at all. Very unusual for him.  Finally he came out but acted very weak like he was hot. so i gave him some water and sprayed him down then he went back under the porch.  I came home from work later to find him dead in my open door shed.  Can anyone please help me if they know what would make a completely healthy dog one day just die the next. Thanks

[timesrt4]

He was eating fine and had no signs of diarhea. I looked around and didn't see any signs of vomitting either.  

[Margot49]

I am so sorry about your dog.  Are you sure he was cool enough and it wasn't heat stroke?
Unless a necropsy was done by a Vet, there is no way to guess what caused his death.  It could be any number of things from something internal, an injury, poisoning, etc.
You didn't say that he had been showing any signs of illness like lethargy, being off his food, vomiting or diarrhea.