We have anecdotal evidence that if a dog eats a shed snake skin, it leaves him rather ill.
We have definitive evidence that an ill dog makes it difficult to put into action many of the plans that the dog's family had for the weekend, specifically going to Ottawa for a wedding.
We also have definitive evidence that it doesn't seem to make the dog ill for very long (12 hours or so) but leaves him lethargic thereafter.
We also have definitive evidence that it doesn't impact on his willingness the next morning should he see a particularly attractive female dog the next morning!
Good times all around.