Harnesses should allow freedom of movement while maintaining safety.
Construction Matters! Look for a “Y” shape
I recommend “Y” shaped harnesses. Note the “Y” shape the straps of the correctly-fitted harness make on the dog’s chest.
When well fit, these should allow freedom of movement of the dog’s shoulders and legs. Many 'anti-pulling' harnesses are designed to impede shoulder movement and cause discomfort. Long term use of a wrongly fit or poorly designed harness can lead to shoulder pain, arthritis, inflammation, and bursitis.
A harness won't make a dog more or less likely to pull, it will simply protect their body and delicate neck if they do pull or lunge while we are working on calmly existing around distractions.
Linked is a short clip showing different harnesses on a dog and how they can impact their bodies.
Here are some harnesses I recommend, ordered from least to most expensive.
Original Designs Roman Dog Harness from Lupine Pet -Features adjustable neck, sternum & girth straps, a back leash attachment, 1/2", 3/4" or 1" strap width choice, and 20+ patterns. Fits girths from 9-44"
H Harness from zee.dog - Features adjustable neck & girth straps, two leash attachment points on the back, and 60+ patterns. Fits girths from 9-42"
Casual Padded Y-Harness from Hurtta - Features padded straps, adjustable girth strap, front & back leash attachment points, reflective stitching and four color options. Fits girths from 12-39"
Hi & Light from Ruffwear - Features a lightweight design, adjustable neck and girth straps, front & back leash attachment points, reflective trim and six color options. Fits girths 9-42"
Venture No-Pull Harness from Hurtta - Features adjustable neck & girth straps, front & back leash attachments, a handle, reflective trim, and a padded front for comfort. Fits girths 14-40"
Front Range from Ruffwear - Features adjustable neck & girth straps, foam padded construction for comfort, front & back leash attachment points, reflective trim and eight patterns. Fits girths 13-42"
Motion Harness from Tags for Hope - Features adjustable neck, girth & sternum straps, a front & 2 back leash attachment points, a padded handle, 1" or 1.5" strap width choice, hardware color choice, and 70+ patterns. Fits girths 24-44"
Perfect Fit Harness - Features a fully adjustable design with three individually sized pieces to the harness & five points of adjustment, front & back leash attachment points, neck buckles (harness does not need to go on over the dogs head), fleece padding on all straps, 15mm, 20mm or 40mm strap width choices, and 14 color choices (three of which have reflective stitching). Fits girths 9-48" & ships from UK. An excellent choice for the most gear shy dogs.
Comfort Walk Air Harness from Dog Copenhagen - Features adjustable neck & girth straps, one neck buckle (harness does not need to go on over the dog's head), front & back leash attachment points, reflective stitching, a padded front for comfort, and ten color options. Fits girths 13-45" and ships from Denmark.
Multi-Way Harness from Wooftown - Features a custom, made to order fit with a few inches adjustability in the girth strap after construction, a front and back leash attachment point, 16mm. 20mm or 25mm strap width choice, hardware choice, and 25 color choices. Constructed from biothane, which is durable and waterproof. Ships from the UK
TRI-Harness from BullyBillows - Features adjustable neck, girth & sternum straps, a front & two back leash attachment points, one girth buckle, and 15 colors to choose from. Fits girths 19-35" and ships from the UK
Flagline from Ruffwear - Features an additional adjustable girth strap, an adjustable neck strap, a front & two back leash attachment points, reflective trim, a handle, a lighterweight construction than the Web Master, and six color options. Fits girths 13-42" and makes an excellent choice for dogs who are escape artists!
Line Harness from Non-stop dogwear - Features padded straps, an adjustable girth strap, a front (in larger sizes) & back leash attachment points, reflective trim and four color options. Fits girths from 11-44"
Hurricane Harness from BullyBillows - Features adjustable neck & girth straps, front & back leash attachments, a handle, reflective trim, and a padded front for comfort. Fits girths 11-50" and is an excellent choice for giant breed dogs!
Web Master from Ruffwear - Features an additional adjustable girth strap, an adjustable neck strap, a neck buckle (harness does not need to go on over the dog's head), front & two back leash attachment points, reflective trim, a handle, and four color options. Fits girths 13-42" and makes an excellent choice for dogs who are escape artists!