Abby came to me with bilateral hernias (on both sides) The breeder didn't know it until she took the litter in for a health check the day before they were to leave. She offered my money back, but I opted to take her and have them fixed when she's spayed.
She's 16 weeks old now and I was really hoping they would mend on their own, but they haven't
Abby isn't 3 lbs yet, so we are definitely waiting to get her spayed. I hope she doesn't have any complications with the hernia between now and then.
I never really worried about it, until I read amandawash's post.
The little boy you are considering is a doll! Maybe you could get your vet's opinion.
Good Luck.