Well I might as well put in my two cents worth. I have had only poodles but I have had them in all 3 sizes......toys (8-10 lbs), miniature (25 lbs) and a standard (45 lbs). As far as their personalities go, it made no difference. They were all sweet, loving and very intelligent. The only one that I couldn't hold in my lap was my standard. It was a shame too because she would try to sit in my lap but she just didn't fit!! I used to tell her that she was a toy in a standard's body!! I think I like small dogs the best for that reason. I love to cuddle them in my lap.