I believe there is one thing that was forgotten since the very beginning of that discussion. It's that we, humans, are also animals. But animals capable of reasoning on situations and choosing out the best solutions, that seem to be the most appropriate for us. The only thing that differenciates a human being from other types of animals is the conscience, the ability to "think about the thinking", if you wish. Only human beings will pose questions as "Why am I?" "What am I?" "Why do I think?" etc. etc. It is the only difference. Because whether it will be for dogs, cats, otters or monkeys, they will not reason about what they do, they will not question themselves while killing prey (if the prey is hurt), being hurt themselves and having sex (obviously). Let's leave that to the humans.
Besides that, nothing else is different. So all those who said that animals don't think and don't have language - well, you're wrong. They do have a language, except it is not as complex as human language. And they do think, when they're hurt, hungry, frustrated, happy, etc. They have feelings therefore they think. However, they will not question themselves on why they think. They will not question themselves on why the trees are green or the sky is blue. But they know that if the trees are green, it's probably in Summer. Or if the sky is grey, it will probably rain. And about safety dogs - well, a dog's senses are sharper than human's. That compensates for the lack of questioning. If a dog will less likely feel something by intuition (like we do when we have that feeling that something strange or awful or wondeful will soon happen), it will either smell it (fire, for example), or hear it (someone sneaking to it from the backside). And that's that.
IMHO, of course =)