Sab - how do you mean? You think that 'suffering' is only possible if we can reason at the human level? No - animals suffer. Watch one in the throws of death, mortally wounded. That is suffering - defined by humans, but suffered by the animal undergoing the pain and anguish is it not?
We see them "writhing in pain" which gives us evidence that it experiences pain similar to us. Is pain suffering? Maybe by dictionary definition, but who are we to speak for the animal's perspective? We cannot fathom the animal perspective because their brains work so differently. In this respect we have the limitation of our human senses not necessarily the advantage of.
-Sab