Brodie has grown out of his harness (petsafe) and the next size up of that one is too big, oddly. So we need a new harness. I think he is an odd shape as he has a deep chest and a very long back so perfect fit seems like a good idea as we can buy the pieces separately. But the perfect fit website is really unhelpful for measuring and ordering. It just says to measure girth, but what about the other pieces? Their breed selector doesn't include working cockers anyway, and as I think he is not a 'standard' shape I'd prefer to measure the pieces separately. I want to buy the 20mm individual pieces I think. Would be very grateful for any measuring tips, am sure I am being a bit dense with this.