When to start agility

A lot of places will have classes, such as the Agility Foundations class here, which can be taken by younger dogs because there's no real jumping. It's a class that works more on the dogs focus, and when we did some of the obsticles, the jumps were all at the lowest setting, which the dogs could easily walk over. But for the actual Agility classes, usually you don't want to start til around 18 months to 2yrs. I started Nell in Rally at first, but because of her energy levels, we went to Agility Foundations. She was about 16 months when we first started. We took the class a couple times. Nell then started Agility 1&2 at 22 months, she's now 2yrs and 4 months.