Any breed can do agility. In 18 years I have seen most dogs do some. I have known a couple of rotties in agility.
The only thing I would say is be aware of the impact on a large dogs joints, landing from a full height jump, they can get injured more easily then a smaller dog.
But there's absolutely no reason why you can't go and do some classes. The Jumps will stay low for quite a while anyway
Eta regarding age. We always started dogs at 12 months. But in recent years people have started taking dogs at younger ages to do poles on the floor between wings. To teach left and right commands etc.
I strongly suggest that you do not let your dog jump over anything before 12 months. It's not good for smaller dogs with growing bodies but it could be very damaging for a big dog. They need to be fully developed first
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