Simple Neck Tie / Scarf with water storing beads that absorb water and slowly release moisture through the day to keep you dog cool. Adjustable by sliding the neck ring up and down to the right size needed, no tying
 
Soak for 2 - 4 hours in a cold bowl of water in the fridge for the beads to reach full size. 
 
Sizes
Large is good for Large breeds (Labradors)  16 - 24"
Medium for Medium Breeds (beagles, spaniel,  collie)  10 - 19"
Small for Small Breeds (chihuahua, pug, yorkie)    7 - 10" 
 
Patterns can be viewed here on the website, under cotton > https://www.craftdoghandmadepetsupplies.com/fabric