Found a puppy about a week ago and have been taking care of her since. I'm not a pet person really so I know nothing about dogs but I'm guessing she's around 12 to 14 weeks old. She appears to be a mixed breed of Sharpei and Pit. Today I noticed a very large mass on the front of her neck, off to the right. It is quite noticable but I do not recall seeing it before today. It feels like a "ball" under her skin. At times I've also noticed a weird, heavy sound when she is breathing, though I have no idea if this is due to the lump. Financially, I'm unable to take her to the Vet. right now but I'm REALLY concerned. I'd appreciate hearing any thoughts or suggestions. Thank you!!!