My brother has a beagle that is 100% anti-social and will follow its nose to anything. It's like 100% of the context of its life is smell. It knows no other world. Maybe your dog is just built to care more about smell than relationships (what we normally think about dogs caring about).
And its not how it was trained. A lot of effort has gone into training it right from the beginning. From the day it was a puppy it never gave a fuck about any other thing besides itself and what smells it can find. I know not all beagles are like that but sometimes personality is hard wired in a dog.
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