Sheepdog Bert, gathering on mountain. I shouldn't have been trying to video it

Bert is a dog that needs a handlers full focus on. No must mean NO with Bert because he always takes advantage of you if you're not on full form or paying full attention. I should have put the phone away for this and enjoyed making the run correct and squeezing a correct double fetch out of him. Instead I had to fetch this bunch in and send him from the start again for the second bunch