This assumes that what is harmful to animals is harmful to humans. If you determine whether chocolate or strawberries are edible by their effects on dogs, none of us would be eating those :)
This is _sometimes_ true, but we will also miss opportunities by not trusting a substance that would be fine for humans but not for mice.
This is _sometimes_ true, but we will also miss opportunities by not trusting a substance that would be fine for humans but not for mice.