'Pick of the Litter' documentary follows puppies' guide dog training

'Pick of the Litter' documentary follows puppies' guide dog training

The documentary filmmaker and co-director Dana Nachman, 46, followed five Labrador retriever puppies — Patriot, Potomac, Primrose, Poppet and Phil — through 20 months of intensive training to see which, if any, would become guide dogs in their new documentary, "Pick of the Litter," due out Aug. 31.