Service Dogs Spend Many Hours In Their Working Harness, To Keep Them Working At Their Best Their Comfort Is A Priority. We Make This Medium Service Dog Vest Here In The Usa By Hand. Machine Wash No Bleach And Hang Dry. We Dont Use Foam Or Felt, Which Cause Heat Build Up And Rot From The Inside. The Unique Buckle Design Allows For One Hand Operation. this Medium Dog Service Vest Is Complete With 2 Side Packs That Are Removable For Easy Access To Documentation. 2 Patches – Service Dog Do Not Pet. Utility Loop For Mini Flashlight Or Poop Bag Holder. Trimmed In Retro-reflective. the New Speed Buckle Option On Our Working Dog Vests Is Great For People With Arthritis, As Well As Service Dogs And Assistance Dogs. harness Measuring 1) Front Measurement – From The Breastbone To The Middle Of The Back. 2) Girth Measurement – The Circumference Of The Dog At The Middle Of The Back. once You Have Your Measurements, See Dog Harness Size Chart : garminn – #1 Front: 11” To 14” – #2 Girth: 18” To 24” – Between The Lucy Small And The Lucy Medium. This Size Is The Best Dog Harness For A Petite Border Collie, Large Rat Terrier, Large Sheltie, Whippet whats In The Box harness For Garminn-sized Service Dogs With Speed Buckle 2 Side Packs Closed = 7” Wide X 3-1/2” Tall, Open 5-1/2” X 7” – Packs Trimmed In Retro-reflective 2 Removable Brilliantk9 Embroidered Patches “service Dog Do Not Pet”