<b>Attention: The important instructions about training dogs accept the dog head collar</b><br><br> <b>If you still have any issues, please check the video by copy the link to the website: https://www.amazon.com/gp/product/B07G21HVVN <br><br> <b>Step 1</b> Put the collar where the dog can touch it, let the dog sniff it, continual praise and treat, repeat until your dog indicates that the collar looks interesting in a way.<br><br> <b>Step 2</b> Take the collar and gently touch it to your dog's body, slowly approaching the dog face. Give a treat. Repeat until your dog feels well.<br><br> <b>Step 3</b> Holding the collar in one hand and giving a treat in the other hand, so he needs to put his nose inside the collar to get the treat. Repeat this steps until your dog seems used to the collar.<br><br> <b>Step 4</b> Put the collar on the dog and quickly lock the buckle. Treat. Removing the collar after several seconds.<br><br> <b>Step 5</b> Repeat step 4 few times until they become used to wearing the collar, slowly lengthen the amount of time they are wearing it. <br><br> <b>Attention:Don't let your dog wear the collar in a long time. </li></b><br><br><br> <b>Notes on fasten dog leash</b><br><br> Please fasten the dog leash to the strap of dog’s neck, rather than D-ring（mouth loop）.<br><br> If you fasten the dog leash to the ring, the collar might be pulled off when dogs are running.<br><br><br> <b>Size Map:</b><br><br> S - Snout Circumference: 6-10""; Neck Strap: 12-16""<br><br> M - Snout Circumference: 7-16""; Neck Strap: 15-21""<br><br> L - Snout Circumference: 9-19""; Neck Strap: 18-21""<br><br><br>