My opponent describes the animal's sixth sense as being able "to tell when someones is hurt or when a natural disaster will happen." Now, think about this question; "How can the animal TELL us that someone is hurt or when a disaster will happen?" The human brain is an interesting thing, as it can translate signs incorrectly, or translate signals differently than originally intended, and this is because of bias, or what we want to happen. As animals could be trying to tell the human something completely different, it may just simply be coincidental that a natural disaster happens or someone gets hurt, as there aren't too many true accounts of animals predicting the future.
There's is true accounts of animals being able to predict or sense what might happen maybe no the future but they do sense something. For example, on December 26, 2004, a magnitude 9.0 earthquake in the Indian Ocean created a tsunami that claimed hundreds of thousands of human lives. But, amongst all that destruction, no mass animal deaths were reported. Along India's Cuddalore coast, thousands of people perished, while buffaloes, goats, and dogs were found unharmed.There are widespread accounts of odd animal behavior just prior to the Indian Ocean tsunami. About an hour before the giant waves slammed coastlines, wild and domestic animals fled " dogs refused to go outdoors, flamingos abandoned their low-lying breeding grounds and flew to the safety of the forests, bats flew frantically away, and zoo animals retreated into shelters. A full hour before the waves struck, elephants became agitated and began to wail. Many broke their chains and headed for higher ground. (Examiner.com)
What if animals don't have a sixth sense, but they simply have a higher sensitivity to such things?
"Animals that detect impending earthquakes don"t necessarily have more senses than humans; they just have much higher sensitivity. The fact that animals have keener senses than humans is well-documented. Dogs have a remarkable sense of smell, birds can migrate using celestial cues, and bats can locate food with echoes. Elephants can detect faint vibrations and tremors (such as other elephants" footsteps) from fantastic distances."
"Animals may sense unusual vibrations or changes in air pressure coming from one direction that suggest they should move in the opposite direction. If a herd of animals are seen fleeing before an earthquake, all that is needed is for one or two of them to skittishly sense danger; the rest will follow " not necessarily due to some supernatural earthquake-detecting sense, but simple herd instinct."
This is not a sixth sense, but rather higher sensitivity to these things as stated by Benjamin Radford.
In conclusion, it is a bit irrational to conclude that animals have a sixth sense. After all, how would we know? We aren't any animal besides human, therefore we cannot speak for the rest of the animals(Nor, do they even speak a language comprehensible to us.) My opponent made arguments that did not even support their stance, considering that animals just have a higher sensitivity to earthquakes, natural disasters, etc. and that does not prove a sixth sense.