Best harness for GSD?

Hi everyone! We’re looking for a harness that fits a GSD well (he’s mostly GSD) even with the adjustable straps it’s difficult to get the right fit. He can be a puller, especially when he sees a squirrel :) photo added for pupper tax. TIA!

Hi everyone! We’re looking for a harness that fits a GSD well (he’s mostly GSD) even with the adjustable straps it’s difficult to get the right fit. He can be a puller, especially when he sees a squirrel :) photo added for pupper tax. TIA!