So you want to debate my comment in sentience, so you prove this by linking a wiki article about consciousness?

Ah, I see you haven't gotten past the abstract. Let me point you to some of the more interesting points: "Despite being subject to debate, descriptions of animal sentience, albeit in various forms, exist throughout the scientific literature. In fact, many experiments rely upon their animal subjects being sentient. Analgesia studies for example, require animal models to feel pain, and animal models of schizophrenia are tested for a range of emotions such as fear and anxiety. Furthermore, there is a wealth of scientific studies, laws and policies which look to minimise suffering in the very animals whose sentience is so often questioned."

So your base idea of questioning sentience just because it's subjective is a paradox that can be resolved by one of two ways. Either you accept sentience and continue studying it, or you say it can't be proven and then you can throw psychology out the window, too. By your logic, you can't prove to me you exist, and if you can't even prove such a thing, why even do science at all? We don't assume pain etc. are proxies to sentience, we have a definition for sentience that we made up to describe this phenomenon we all experience. "You can't prove something that we all feel and thus made up a name for it because we can only feel it" kinda makes no sense. We even have specific criteria for it: https://www.animal-ethics.org/criteria-for-recognizing-sentience/