I have the book "The Intelligence of Dogs." Dr. Coren is basing his findings on how many times you have to repeat something before the dog gets it based on Obediance Training. He's just saying that with some breeds you have to repeat it more times for it to sink in. lol

I have a Yorkie and took her to Obediance Training (Yorkies rank 27). I found it pretty easy to train her.

XoX
Joanie, Tiffany and Shana (my cat)