If anyone is having trouble finding a pug stud dog and is particular about finding a quality stud dog from good lines, all KC registered and with the relevant health testing, then look here. There are dozens and dozens of them. Plenty about despite people telling you that they weren't able to find a single one

Don't risk using a dog which isn't KC registered, may not be pure bred, is probably mismarked and has no health testing at all so may well be carrying something nasty or have a high hip score which could see your puppies crippled by the time they are 5 years old.
Pug Stud Dogs in UK
Stud Dogs
Pug Stud Dogs