To assess your dog's weight using their ribs as a guide, you'll want to follow a few simple steps.
Place your hands on your dog's ribcage, with your thumbs on their spine and your fingers on the sides. Give them a little petting to let them know they're doing great!
Now, time for the rib-check. Gently press down on the ribcage to feel their ribs. You should be able to feel them without pressing too hard. If you have to press with a bit of force or can't feel the ribs at all, your fur buddy might be carrying some extra baggage.
Ideally, you should be able to feel each rib without them being too prominent. If the ribs are sticking out like the Rockies, your pup might be a bit too lean.