I have 3 dogs all over 100 lbs. The biggest being 160. I wouldn't even put my ball pythons in a situation where any of them had a chance of being swatted at by my dogs. I suggest if you did the same with your cats, everyone would be able to live in harmony.
But being worried about a cat getting in your snake enclosure, has long as your cat doesn't have thumbs to open a latch, pull a tub, or take a screen lock off. You should be fine.
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