My wildest babe has been wearing this harness nearly everyday for about 2.5 years. I got this for her when she was a puppy, thinking she’d grow into it. It was only yesterday I realized she’s wearing a sz medium when all her other Ruffwear gear is small. So, an ill fitting harness has taken this girl through miles and miles of rough trails, rivers, grassy somersaults, and camping adventures, and still holds her in- which is a feat! I’m here to buy her a new harness, size small, and will likely use this one for my hound dog! Definitely a solid piece of gear for a dog who never stops exploring!