A dog eats bread during a walk and it dies.

The dog under walk ate the bread put on the road.The dog died.Poison had said ON.
The owner said.It is a golden retriever (9 years old of males) about the dead dog.Condition, such as vomiting, came out of the dog.And it died after about 2 hours and a half.The dog was fine.I regarded sudden death as doubtful.Furthermore, the owner looked at bread in the place almost same during a walk.The police was notified.It was put into the toxic substance by bread.The police regarded it as the vicious incident and began investigation.
The postscript of edit.I keep two dogs.Cautions are required during a walk.A dog will eat simply.I dislike those who abuse an animal.