
I suggest joining the British breed clubs (assuming that English is your first language?) and getting the back issues of publications.
Breed Clubs and Societies
NORTHERN PUG DOG CLUB. Sec. Mr P Davis. Tel No: 01427 728464
PUG DOG CLUB. Sec. Mrs A Nicholson. Tel No: 020 7352 2436
SCOTTISH PUG DOG CLUB. Sec. Mr S Payne. Tel No: 01560 322119
WALES & WEST OF ENGLAND PUG DOG CLUB. Sec. Mr J Phillips. Tel No: please contact the Kennel Club for details.
You may find Pug breeders somewhat diffident with new people wanting to get into breeding, as sadly there is a fashion for the breed at the moment so there are people looking only to exploit the breed, so the breeds custodians are naturally wary.
You really need to have some mentors in the breed.
Problem is that when you are immersed in a particular bred the quirks for you are the norm, and you may not think to point them out as you may even be unaware that other breeds differ.
I don't know if being a Short nosed breed has anything to do with pups being slow to get going, they are just so different from my natural breed who do things a lot quicker than it says in the books.
My pups are up on their feet toileting, barking and wanting more space to be clean away from their nests very quickly.
By 4 weeks they need to be able to have space to run about and need to go outside as a puppy pen is too restrictive.
In other breeds even large ones the pups seem much more immature, an some of the toy breeds aren't what I would call robust as pups. Losses at several week seem common where as I would expect in my breed that any pup living past the first few days and certainly to two weeks to survive.
There is a member here called Gwen who breeds Pugs, she doesn't post often but might be worth sending her a PM.
This article on the Kennel Club website may be useful:
http://www.thekennelclub.org.uk/download/1615/hspug.pdf