Yes it is!
...BUT...here's how Breeders get a FREE ticket...
All the make up is there in their genes for their Patella to Luxate, however, MOST are not born with their patella's luxating, but once they start to grow, play, run, jump...oops...now we have the luxating patella
LP can happen from injury, but that is most often truly found in large breeds.
When LP happens in our guys, it is because their 'make up' is going to allow for it.
Good luck going after the breeder, I hate to say it, but I doubt you'll get any money for it.
Now, back to LP.
There are only 4 Grades. LP doesn't get better on it's own. Whatever damage that gets done to the cartilage from the patella luxating CAN NOT be replaced or repaired. It is truly advised to have corrective surgery done for Grade 3 and Grade 4 to prevent any further damage. These little ones do excellent after surgery. Also, it is BEST to have a Board Cert. Ortho Specialist do the surgery, it can get pretty creative in their legs and it is best to have an 'artist' - if you know what I mean.
Keep us posted! I have 2 of my own that have LP. Roxy has had her surgery. TJ's isn't that bad yet.
Do a search here on YT:
Luxating Patella
You'll find LOTS of posts to read all about it.