How tight should a dog harness be? A dog harness should be snug enough that it does not rotate or slip, but loose enough to be comfortable. Use the two-finger rule: you should be able to fit two fingers between the harness straps and your dog's skin. If the straps are digging into the armpits or restricting the shoulders, the harness is too tight; if the dog can pull their elbows out of the loops, it is too loose.
Step-in harnesses are popular for small dogs and those who are sensitive about their heads or ears being touched.
These are common for larger, active dogs and "no-pull" training models like the Ruffwear Front Range.
A harness that is too loose allows the dog to "Houdini" their way out, while one that is too tight can restrict breathing and cause skin sores.
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