I wouldn't think so! Just make sure she's physically fit and not carrying any extra weight.
I started my first agility dog when he was 4 and he did excellent
My Malamute I have now, started him in puppy agility but then I took years off, he just started back in beginners again two sessions ago (each session is 8 weeks) and he will be 5 this May. So, nope, not too late
I started my first agility dog when he was 4 and he did excellent
My Malamute I have now, started him in puppy agility but then I took years off, he just started back in beginners again two sessions ago (each session is 8 weeks) and he will be 5 this May. So, nope, not too late 
