One of the best features of an agility tunnel is that it is able to be used by so many different dogs. Large or small, young or old. The agility tunnel is safe for young dogs whose joints are not fully developed, and for elderly dogs that may have problems with mobility. Tunnels do not have the same impact on joints that jumps or weave poles have. Of course, healthy, athletic adults also have a blast with the tunnel! It is a favorite obstacle for many dogs.