I think a lot has to do with the breeder and how they raise them as well. Angel was paper trained when I got her at 13 weeks and VERY loving right from the beginning. She still occasionally pees somewhere other than the wee wee pad, but is about 90% trained. Sissy was not at all trained when I got her at 13 weeks old and went wherever, whenever. She also was very loving though. They are both very cuddly pups, though don't seem to mind who does the cuddling!!
Neither do tricks. I tried with Sissy and she just wasn't having any of it and I haven't even tried with Angel......
__________________  Sissy & Angel |