Daisy was 32 I think.  When you look at the sizing for the Ruffwear harness it says to opt for the smaller size if they fall into both.  I went with the large and I should have gone with medium.  It seems a little long on Daisy.  She too is big chested but skinnier in her waist.  I've adjusted the waist part to the smallest it'll go but it is still a little loose.

It'll still work but in hindsight I should have gone with the recommendation.

Marla and Daisy

Our Lylee is 85lbs and has a chest girth of 32 inches. She was fitted at a 2nd opinion orthopedic surgeons office and they had her wearing a large. So we have been using the large for sometime and then at the most recent tripawds pawty we had a surprise gift form Shelby's Mom of a medium Ruff wear harness!(A tripawd from the local Humane Society was wearing one and they decided not to adopt it out with their harness?! and gave it to Aunt Cindi)

I always thought a medium would fit her better and guess what – it did! It did look small before i put it on her but once fitted it looked great and actually works better. On the larger harness the straps had lots of excess hanging down and is a bit long, with the medium I maxed out the shoulder straps and the front girth strap had about 2 inches of extra and the 2nd strap has plenty more about 5 inches. (Lylee thinks it makes her look slimmer too :)

Good luck!

Joanne & Lylee