[kach22i]

OutFox Field Guard
https://www.outfoxfordogs.com/product/outfox-field-guard/

The patented OutFox® Field Guard is designed to help protect your dog’s eyes, ears and nose from foxtail penetration while walking or running over trails or through grasses, and while engaging in casual sniffing. Additionally, the Field Guard can be used to prevent dogs from scavenging and eating harmful items and to protect their faces from insects such as flies and mosquitoes.

Foxtail Grass and Your Dog
https://pets.webmd.com/dogs/foxtail-grass-and-your-dog#1

The foxtail plant is a grass-like weed. It is mostly found in the Western half of the U.S.

The danger of foxtails goes beyond simple irritation. Because these tough seeds don't break down inside the body, an embedded foxtail can lead to serious infection for your dog. It can even lead to death if left untreated. The seeds can be hard to find in your dog's fur.

That makes more sense.

http://foxtaildogprotector.com/

Foxtails have barbs that make it possible for them to travel only in one direction, so they gradually work their way further and further into your dog’s skin, causing a painful sore that must be treated by a veterinarian. This can cost anywhere from $200 to $1,000 per occurence