Divits: I also set up 12 weave poles right over a divit in the ground at the 3rd dog step thru. I have to teach Maxie to be comfortable with the inevitable divits the larger dogs dig on soft courses, especially in the weaves. He's NQ'd at least 3 times refusing to step into a deep divit at the weaves.
Practice went fine thru serpentines and weaves until my mostly whole, still wrapped in plastic, string cheese fell out of my pocket, Charlie ran off with it and the harder we tried to catch him to take it away, the harder he tried to scarf it up, until he finally swallowed it whole. Charlie, mind you, is a 12" high Boston Terrier that weighs about 12 lbs. The string cheese is 1/3 the length of his whole body. We were teriffied he would choke to death or need surgery to remove it.
I called the vet, who recommended 1 tsp. hydrogen peroxide to make him throw up. We tried administering that a few times with a Cajun Injector, with Sheryl holding him on his back and mouth open, but he coughed it up. It went flying in the air and landed in his eye, so we had to get a damp rag and wipe it out for fear of blinding him as well. We were afraid to give more and he never threw it up, but I found out at class last night we could have given much more hp. The vet also said Charlie would probably pass the item within a few days with no problem. So now we wait.
That ended our training session prematurely, though, and Sheryl just wanted to take him home. Can't say as I blame her for that. I would be beside myself if Maxie swallowed an entire string cheese, still in the plastic wrapper!!!!! I would be wanting desparately to reach in and get it out of there.
You just never know with kids, cars and dogs!