Which coton de tulear should I choose?

by Sarah

I've been talking to a breeder about adopting on her retired Cotons (this would be my first dog) but I've run into a couple of problems.

First of all, the male is 4 years old and is not neutered. He is potty trained but wears a diaper in the breeder's house. However, she predicts that once he comes home with me, he will start marking and since I've never had any dog experience, it will be hard for me to fix this behavior.

Secondly, she also has a 9 month old Coton de Tulear puppy that she was hoping to keep but realized might have a loose patella. But she's a girl and I wanted a girl. What should I do? Would it be easier to get the adult male and then train him or the female puppy even though she might have that lose patella. What should I even do with a lose patella? What are the chances she might need surgery? Will she be lame in one leg?