I did not plant this. I have lived here 10 years and this is the first time I have seen this berry in my yard. It is growing under some old pines and a cottonwood.  I was told by a friend it is a chokecherry, but the cluster of berries doesn’t look like chokecherry pictures I have found. 
Before I harvest the berries for a friend to can, or destroy the bush if it’s toxic to my dogs, I want to know what I am dealing with. 
thank you.