1. No brindling or all black coloring
2. Mousy coloring
3. Black and tan coloring
4. Over 28 lbs
5. Under 18 lbs
6. Wry mouth (crooked lower jaw)
7. Tongue too long and hangs out
8. Teeth and under jaw protruding too far forward
9. Pink pigment on eye rim, nose and lips
10. Light eyes on a dark colored dog
11. Ears don't stand up or not bat ears
12. Wall eyed or too much haw
13. Black or brown "ticking" in white of piebald dogs
14. Tail sticks straight up off the back
15. One or no testicles on male dogs

Conformation and Qualities:

Other considerations could be length of back or length of leg or fine boned.  They may not be balanced or symmetrical in the body, head or face. Their ears too short, bite may be off or movement could be less than correct.  They could be straight angled in the rear, slab sided in the shoulder, head round instead of square or hollow under they eyes. The tail maybe high set or back flat lacking the distinctive rise over the loin and so forth.  Also, the sex of the dog or the dog just may have a poor attitude and not fitting their preference.

These are often reasons, what I call progressive breeders, may place their French Bulldogs instead of choosing to show or breed them.  It is usually the degree in which these difference draw attention or take away from the overall qualities of the dog, when judged in conformation and for breeding.  The breeder has to determine what to keep and move forward with.

The breeders goal should be to improve on what they have and  correct faults, that may improve on future French Bulldogs they may exhibit or breed.

Temperament is also an issue in some cases.  This is why breeders that know their dogs are particular about the right home.  Some dogs that are just born timid may have a difficult time socializing with other dogs.  They may have been bullied by their siblings or by an older dog.  Some that are quiet may prefer not to be bothered by other dogs.  Some that are boisterous may aggravate others until they get into trouble. These dogs may react harshly and might do better in a home where they are the only dog.

Not all of these differences are clearly recognized in very young pups and may take up to three and six months to realize.  The same is often true with health issues, genetic or otherwise, and may take even longer until almost reaching maturity at about 20 - 24 months.

Buyers don't always know what they're getting in 6 to 8 week old pups and younger. French Bulldogs change as they mature.  They also have a high mortality rate.  Often breeders have lost seemingly healthy pups even at three weeks of age. A beginner may feel misguided by some breeders promising pups before or even just after they're born.  And potentially gullible to believe breeders are 100% capable of determining a young, pup will grow up and be a show champion.

Personally, I don't advertise having a guaranteed anything at 6 to 8 weeks of age.  However advertising healthy, happy new pups for placement, is fine at that age.  My pups don't leave the nest usually before 12 to 14 weeks and sometimes longer.

Other Reasons:

1. Dogs are retired
2. They have too many dogs
3. The dog has a greater advantage in a different home
4. Minor health issues undesirable for showing or breeding
5. Show potential - keeping their dogs in competition
6. To other respected breeders seeking quality dogs to enhance their lines
7. Pedigrees that blend with breeders that may return pups or breedings
8. Pedigrees and or pups in join ownership that benefit the breeder(s)
9. Dogs that will be shown by professionals
10. Affluent people sharing joint ownership and paying expenses
11. Advertising - vanity
12. Income purposes