Captions needed for this pic of two English bulldogs.

And if Tryptophan doesn't do the job, Gary, there's always Doggie Downers (diphenhydramine hydrochloride)!
If that and all else fail, tiny amounts of hydrogen, carbon dioxide, and methane combine with hydrogen sulfide and ammonia more commonly known as fart gas, can knock anyone and anything, out cold, as seen here.
 

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