[blueskies]

10 weeks is too young to diagnose LP. Many puppies under 6 months have "loose knees" due to the major growth and change their body is going through. Many will grow out of it within a few months after their knees have adjusted and are set into place. I would wait until she is over 6 months and then have your vet xray the knees. If it is truly genetic it should progressively get worse and an xray should show a groove much too shallow for the patella. LP is a very difficult thing, and the reason why most breeders don't cover it is because of the possibility of injury as the cause. It is very easy for a small dog with excellent knees to suddenly have grade 2 in both after a fall or several jumps off a high place (bed, couch, etc.). The more active the dog is, the higher the chance that he/she will knock their knees out at one point or another during their lifetime. A grade 4 is almost always genetic, but under that it's very hard to tell. Now, that being said, if it doesn't go away I would not breed her, regardless of whether it is genetic or not, because a pregnancy would be particularly hard on a female with a bad knee.

Also, I did want to point out that two parents CAN have perfect knees and produce a puppy with bad ones. A breeder could very well be telling the truth if he/she says that the parents have good knees. It does happen, and also in reverse. You could potentially breed a parent with LP and get a puppy with perfect ones. There is so much uncertainty about the genetic/injury aspect, combined with the fact that, like most genetic defects, can skip generations, that it is truly a difficult thing to put your finger on.