Lin,
I don't believe that the problem comes from the tunnel bags. I have a very big boy, he is not a normal agility dog. NADAC has replaced some tunnels with barrels because they would have been a tight U shape, and this can be hard for some dogs. I've run tunnelers when there was a barrel on course, this allowed the dogs to turn as tight as they could, but if they can't turn tight, it allowed them to make a wider turn.
I also don't let him go across a dog walk, because for him, it's not safe. He is too big, and he wants to run agility at full speed. Just because something is not right for Arthas does not mean that there is something wrong with what is set.
I just had to learn what he can do, and what it not right for him. If something ever looked like it unsafe, I would say something, but just because it's not right for my dog does not mean that there is something wrong with how the course was designed or how it was built.
Connie
Hi Connie,
Tight tunnels don't cause the problem it is the incorrect bagging of tunnels that can cause injury. Check them out. You have every right as a competitor to ask that equipment/courses be safe for your dog to run. It must be wonderful to see a Mastiff doing agility, we don't have any around our area. Keep up the good work and have fun. I'm sure he is a good representative for his breed.
LinB
mdt-AA LLC