The breeder may have felt that the pup with the hernia was a better match for you. A hernia is nothing. Usually the dam pulls a little too hard when biting the umbilical cord. Sometimes they close up on their own, generally you can leave them alone and no issues -- Tori has one, she is six, never caused me a moment's worry. Or, you can get them fixed when you get them fixed.
I am just saying, it wasn't like he was trying to pass off a defective puppy.
It sounds like your puppy developed cancer and it metastasized into the lungs. I am curious if your pup was fixed and if so, at what age. 14 months old is really young to die of cancer, but look at humans, yes mostly older people get cancer, but then you also have little kids getting cancer.
I am really sorry though. It is so hard to lose them at any age, but babies, that is like a double tragedy.
Jenna, RN CGC & Babs, CD RA CGC HIC
Heidi, RA CGC
SG3 Odessa, SchH1, Kkl1, AD
Ninja, RN CGC & Milla, RN CGC
Joy, Star Puppy, RN CGC
Dolly CGC & Bear CGC