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Yeah, I can see that, but with a horse it’s more about training I would imagine. A punishment/reward system. With a dog it’s more buddy like. I’ve never really had to chastise my dog, other than perhaps a little shock value smack when he was a pup. As for rewards, it doesn’t even have to be a treat (although it helps). Sometimes his reward appears to be just seeing me smile or laugh, which brings me on to sense of humour. My dog certainly has a sense of humour and knows what’s funny.
All that aside, I wouldn’t want a horse jumping up and sitting on my knee.
I can see an experiment coming on. Give your snake two dishes and see which it prefers.