The problem with B.cognatus is, they have such an extreme range, from mexico, all the way through the U.S. to Canada. Depending on where your toad came from, They may hibernate for several months, or, like you said, just go turpid for short periods of time. If your toad came from the northern part of the range, I would say go ahead and hibernate them. If they came from the south, I would just mimic their normal temp ranges. This is really more important if you plan on breeding them. If not, I would just cool them a little in the winter and not worry too much about it. Like I said, In the extreme southern part of their range, I doubt very much the temerature ever drops anywhere near freezing. There are no subspecies listed for cognatus, so knowing exactly where they came from (without knowing where they were collected) is next to impossible.
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How to get your wife to like toads; 1.Get a male toad. 2.Get him to hug your wifes wrist (amplexus). 3. Tickle him so he chirps in protest. 4.Say "Awww, he likes you". Note; Make sure he pees first or you may receive bodily harm during this procedure.

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