I would be skeptical of research that says other animals are incapable of reasoning. I think it would be more along the lines of the limits of their reasoning,

I would be skeptical of research that says other animals are incapable of reasoning. I think it would be more along the lines of the limits of their reasoning, and other abilities to utilize the reasoning they're capable of. Clearly there are some differences between humans and other animals, even other primates. But it's hard to quantify those exactly. If humans have reasoning score of 10, do dogs have reasoning of 1 or 5? Even the variability among people and measurable differences between individual dogs or breed of dog further complicates that.