You feed him peanut butter and jalapeños

Currently, I'm approaching this from another angle. Instead of giving training data, I'm trying to use the same inferences vets use to determine if the dog is in pain. For ex: if the dog has flattened ears or grimacing look.

I'm still reading research papers to figure what's the best way to approach this problem. This is just the first step and I'll see what can be done regarding collecting data later on.