Absolutely not. We can know that snakes don't feel emotion as they lack certain parts of the brain, parts that humans and dolphins possess, that process emotion. Also, to say that you will with hold any decision either way until we have 100% certainty that they dont feel emotion is you putting yourself out of ever having to make a decision. Scientific findings typically find 95% or higher probability to be statistically significant, so setting the bar at 100% is rather convenient for you, isn't it?
I was beginning to lose all hope till you posted that lol
I seriously cannot get my head round what some people believe