Hi and welcome to YT!
Poor little Paxton. Bless your heart for helping this little baby. I was the same way with my middle yorkie (Maya) when I found out she had a liver shunt. The breeder (a local breeder) said "bring her back and I'll give you a new one". By that time we had spent thousands of dollars on her care and were so attached to her. You must get the word out and publish the breeder's name so others don't purchase a sick puppy from them. This breeder has no heart for selling sick puppies.........no heart for the health and wellbeing of these helpless little creatures. I'm so glad little Paxton is feeling better and is eating and playing. Hopefully he will get to come home with you soon. Hugs to you!