Question: Why are cats and dogs so different?

Answer: Dogs are social creatures, happiest as a pack, and operate in a clear hierarchy with a leader and followers. Hopefully, your dog views you as the leader and not the other way around. What makes dogs so distinctly different from cats is that a dog's attachment is to his family and much less to his territory.

Cats don't develop strong pack structures where leadership is important. Feral cats that you often see in colonies are actually mostly solitary creatures that hunt alone. The members of a colony share a common territory much more than the establishment of a cohesive pack.