Why is my Cane Corso puppy's rib sticking out more on one side?

Hi and thanks for using Petco Pet Education Center, formerly Petcoach! Sorry to hear about Nala. Hard to tell from just one picture but I see the protrusion of the rib cage. The last rib on the rib cage is what we call a "floating rib" because it doesn't connect to the sternum or breastbone. This protrusion looks more towards the front of the rib cage in this picture. The best advice here is to let your veterinarian take a detailed history and perform a complete physical exam. They may advise some chest x-rays to evaluate the structure of the ribs and look for any problems. Some rib cage abnormalities are not significant and some are. It just depends on their severity and what exactly the abnormality is. It's possible some injury occurred during birth or playing to account for this. Really hard to tell at this point. I would let your vet check this out and I would do it ASAP if this is something that just came on suddenly and Nala has any degree of breathing problems. Good luck and I hope this is just a structural problem and won't lead to any health problems.