There is much we don't understand about the brain, but in those grey areas of our understanding we have to go by what we understand so far.
And in what we understand so far we have to resist the urge to prove by asserting that we can't prove a negative. It's true; I can't prove that animals don't have consciousness. That's proving a negative, which is impossible.
But I can look at the animals I've known, avoid the urge to anthropomorphize (i.e., humanize) them, and see that very obviously they lack an enormous amount. Even the brightest ones I've known are not able to solve basic problems. And training! Take housebreaking for example; if you don't catch the dog in the act, you can't correct the behavior, because dogs are unable to connect your anger with a changed condition in the room... that they created.
And I've said it before, but if you die and there is no other food source, after a few days most pets will eat you.
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