You make a good point about human sympathy. Still, if you look at biological and neurological evidence, it appears that dogs are built in pretty much the same ways we are. They have the same senses—in fact, their senses are stronger in some cases. They have the same evolutionary reasons to react to pain. The parts of their brains responsible for pain look the same as ours. The biggest difference is probably that we have cerebral cortexes and they don’t, but that part of the brain isn’t especially important in responding to physical pain. Other forms of pain, yes; and I would agree that humans can feel some negative states more strongly than dogs can. But it doesn’t look like physical pain is one of those states.
You make a good point about human sympathy. Still, if you look at biological and neurological evidence, it appears that dogs are built in pretty much the same ways we are. They have the same senses—in fact, their senses are stronger in some cases. They have the same evolutionary reasons to react to pain. The parts of their brains responsible for pain look the same as ours. The biggest difference is probably that we have cerebral cortexes and they don’t, but that part of the brain isn’t especially important in responding to physical pain. Other forms of pain, yes; and I would agree that humans can feel some negative states more strongly than dogs can. But it doesn’t look like physical pain is one of those states.