Running on windows 8, and using internet explorer, the pedigree of any pet is only showing the parents, no further back. This occurs whenever I use the pedigree tab on a pet's page, and has been occuring consistently for three days now. The pet shown is grade three inbred, so it is not possible that this is the entire pedigree.

When you joined the site you got 2 weeks of free Premium. Premium has a few other perks too but the one relevant for you right now is that you were able to see a pet's entire Pedigree.

Those two weeks of free Premium are now over though, so you only see the parents of each pet. If you want to know if a pet is inbred you will have to manually click through every pet in the lineage (or buy Premium ofc).

You can check the FAQ for the other Premium perks. 

Ohh alright, thank you. I hadn't realized, that makes things way more complex