Rattlesnake Attacks Puppy

When we first found the puppy bitten by the rattlesnake, we assumed it happened in the tall grass by the bird pen while on a walk with puppy owners.(See https://sneakingbliss.com/2018/08/26/rattlesnake-strike/) It just made sense that the puppy surprised the snake and in defense the snake bit. Yesterday, I reviewed footage of the puppy cam to see if I could observe any odd behavior after the puppies returned to the playpen following the walk. What I saw was unsettling to say the least. As the video plays, keep an eye on the right side of the ball pit.