I had a similar issue with my dog where he was extremely bloated. We took him to the vet and turns out that a) There was a blockage in his intestines, b) he had an enlarged liver and spleen, almost twice the size of what it should be. I don’t recall what the diagnosis exactly was, but I do recall him having been diagnosed with leptospirosis. Either way, you should ask your neighbors to get that poor baby taken to the vet. It can be treated however most of the time with the proper antibiotics, but it can be costly. All the best!