See that lit-up plant? That’s dogbane, Indian hemp, Apocynum cannabinum. It isn’t related to that other hemp, Cannabis, but oddly enough IS related to the Madagascar palm, and has the same rubbery, milky sap.
The hemp part of the name is because native Americans used this plant to make baskets and cordage. Some people still use it today. It’s a common weed in my area.
And, yes, it is toxic not only to dogs, but to all animals!