Pedigree Query depends on people adding horses which anybody can do but someone has to know there's a gap in the database info. If you know the dam + birth year or the horse's name, when it comes to getting enough to add a horse on PQ, you can usually get the sire/dam/bm sire, place of birth info from here:
https://members.breederscup.com/nomi...igibility.aspx Make sure it's the right horse if there are several listed for that name otherwise PQ's entries get tangled up because someone picked the wrong mare for the dam then added progeny.