When looking at a pet's page you're shown the Mother and Father, or "Wild Pet" if it is wild, and are capable of viewing the parents if it was bred. All you do is click on the link attached to the parent's name and you go there.

If a pet has been pounded it tells you and gives you the chance to adopt it. You can not view the genes of pounded pets. If a pet has been sent to the portal you are sent to a page telling you this as well. Pets in the portal can not be retrieved. If the pet belongs to someone you go to the pet's profile.

I was looking through the trades earlier when I came across Gotham who is up for sale and has roughly 4 hours 30 mins left. When I went to look at his parents I was shown that his mother Moors resides in the pound, but his father, Claude, brought up an error page. This error shows up when I try the link from both Gotham's trade, profile, and pedigree.

Screenshot

It happens when a pet is in the Reserve or the State Portal. We can see the individual pets in our own Reserve, but not those in other people's Reserve (Even if they've set their Reserve to public)

Not a bug when pets are in the state portal, they're gone, it makes sense. But I feel like we should have the ability to view pets that are in another user's Reserve and have them show up like they do for the owner. Its useful to be able to see the genes. 

Ah, thanks Aelisk!

This would have been my first time encountering a pet that's been sent to the Reserve. I've seen the Portal and Pound before, so I knew seeing the Portal for the mother was normal, but didn't know what to make of the Invalid pet page.