large, medium and small
I had German Shepards most of my life until the last 10 years when I got a Laso Opso mix, a smaller frame dog, from the pound. He was as smart or smarter than the German Shepards who were plenty smart also. He's gone now.
At the present time, I have a Manchester Terrier, a medium size dog, nice, smart and a sweet dog, but he's faster and a unmanned airborne vehicle and will run your legs off.
Certain breeds are runners and chasers, others are more sedentary and make good lap dogs. Older folks can't keep up with the lively ones so just look into what your the breed's characteristics before making that commitment.
The answer to your question will only be as detailed and specific as the question is detailed and specific. Good questions also include a sketch or a photo that illustrates your issue. (:< D)
Last edited by woodnthings; 11-02-2014 at 10:26 AM.