I've heard about doing certain activities with your dog before it's fully developed can be harmful. I want to sign Clover up for agility but she's only 7 1/2 months old. I asked the place if there is certain age they need to be, they said no. I'm still a little wary. Should she be 18 months at least before starting something like this? It would just be beginner level so she probably wouldn't be doing anything extreme.