We were hiking in the woods the other day and came upon a couple with two German Shepherds. The dogs wore goggles.
While we watched, one of the couple held the dogs while the other person hiked far into the woods and hid a blue "bone." When that person rejoined the spouse and dogs, they waited a bit, then gave the command "FIND."
The dogs raced off into the forest. A short time later, the dogs ran back. One of them had the blue bone in its mouth. A great game of course. The first time we'd seen it with dogs wearing goggles.
If your dog has a head injury you don't want it to scratch, you put a big cone collar on it. The dog will of course try to get that cone off. I would have thought that once out of the observation of humans, the dogs would shake and paw-off those pesky dog goggles as well. Shows what I know.
The people explained that the dogs like the goggles because, as with people running through trees and brush, the dogs don't have the stress of branches poking at their eyes.
Wow, and I thought the dogs I've seen wearing sunglasses just did it to please their owners.
Another example of dog smarts.