Yes, there are vast numbers of them. I know doctors who do not believe the dog at the door wagging its tail when the person arrives to be experiencing emotions.

Yes, there are vast numbers of them. I know doctors who do not believe the dog at the door wagging its tail when the person arrives to be experiencing emotions. I believe the dog is happy and excited and eager to greet its friend of another species, but many, many people believe that dog is exhibiting purely mechanical behavior driven by instinct alone.