Earlier quoted context omitted.
Dogs have agency and can choose? That seems like a rather uncommon take on dogs...
Not if you have a dog. They’re very clearly aware, have minds, have thoughts, gather information, make decisions, second guess themselves, reflect on the immediate consequences, change their mind… and most importantly, you can observe them doing all these things undirected, while left alone with their thoughts.
We can't really know the dogs inner life so we just kinda have to reduce it to a set of behaviors selected stocastically.
The dog meanwhile has no ability to understand the weedwacker or what it's doing on its back.
So when the guy puts the weedwacker on the dog and the dog predicably does dog things and that results in disaster the guy isn't able to clutch his pearls and say "I guess the system broke containment!"