I thought I was going to have trouble with Tinka doing the rollover, but she learned in 2 days. At first I had her sit, then down and then when I said roll over, I physically rolled her over. She didn't like it much. I did it several times and gave her a tiny treat each time. The second day I went to try it again - I had to roll her over once, then she started doing it on her own.
Now, whenever I say, "down" - she automatically lays down and rolls over - not exactly what I want her to do - especially in training class! So, now we have to work on the down/stay instead of down/roll.
omega