Thanks so much for your kind words- in an ideal world we would be able to let our dogs and cats roam freely but it is just not safe for them to do so and even in the "country" there are hazards of being shot if they try and mess with a farmers livestock.
Ever think about the natural fauna one would be killing too by letting ones cats roam free. Case in point, there was a species of bird on an island out new New Zealand that was killed to extinction....by only ONE cat. This was back in the 1800s and early 1900s.
Not to get off topic, but "outdoor" cats do far too much damage to the beloved reptiles and other animals we claim to care so much for. I love cats, we've always had a cat in the house (though now that I live by myself I don't have one) while I was growing up. But I have a severe problem and issue with someone else's cat coming into my yard and crapping in my turtle pen, giving my turtles coccidia or other parasites/diseases, all because they want their cat to be both an inside and outside cat.
In an ideal world all animals could live on coolwhip, but this isn't an ideal world. Just think about all the nice little native lizards and snakes, plus other animals one would be unknowingly killing by letting their cat roam free. And they don't just kill to eat, they kill for pleasure at times.
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Now as for colling leos...I've done it in the past. I would reduce temps and food intake just like I would with my snakes, eventually getting to a point where they are only heated by room temps and are no longer eating. Then it was off to the garage where temps ranged from 50-65 from Nov to March. Now granted, the leos would only be down for about a month, 2 mnoths at the most, but they never really lost much weight and they had water at all times.
FWIW, even out in the wild, hibernating (brumating) herps can be found during the cool months. Twin-spot rattlers have been observed basking on talus slopes in the Chiricahua Mnts with snow on the ground. Ambient air temps were in the 30s and 40s and the rocks they were basking on were in the 60s and 70s. But this is also a high elevation snake (8000ft+). Along the foothills here around Las Cruces, NM you can find rattlesnake den sites with rattlers out basking on warm winter days in Nov-Feb. I would venture to say that in the northern range on leopard geckos I bet they do brumate!