Here's my totally unsubstantiated theory of dog ownership:
1. Academics and innalekshuals tend to own cats and not dogs;
2. Childless couples, dogs (more fun to be with, more romping outdoors)
3. Fascists and militarists, powerful, menacing dogs: Rottweilers, German Shepherds, Doberman Pinschers. These are physically or mentally insecure people who identify vicariously with the power of a military force and rely upon that identification to assuage their true inner feelings of insignificance and powerlessness. The dog, on a much lesser scale, serves the same psychological purpose as the military.
5. Democrats: Democrats are more imaginative and creative than Republicans, so they tend to be all over the map in dog ownership - - those with "Lord of the Manor" fantasies can get Old English Sheepdogs or Airedales, or they can go for cute, small and practical in homage to their working-class backgrounds, working dogs like Jack Russell Terriers, kids' dogs (cocker spaniels, dachshunds,) trademark dogs (the Haig & Haig Scotch terriers) - - except for the scary guard dogs, all kinds of dogs - - particularly mutts - - can be found in Democratic households.
6. Women, traditional: smaller dogs, "cute" dogs; or cats.
7. Women, feminist, "liberated:" same dogs as "men," i.e., as fascist and militarist men, simply to prove a point; or if they are beyond proving points, then cats, smaller dogs, cuter dogs.