Is this what happens when the premium period expires? I had 4 full rows of pets and now they are all gone except for the starter ones that I got the first day or so. Even the ones I got in giveaways and things like that have dissapeared. Can anyone explain why this happened?

Hmm, you should not have lost any pets... Did you have any pets in trades that have since sold? Were they accidentally pounded or sent to the State Portal Service? 

I don't see any pets bred by you since the feature became available, otherwise I would use that to tell where some went. 

The stable cap isn't "off" then turned on when premium ends, so it would not be that.

If not these things then I am not sure what... I suggest a post in the "bugs" forum so that Angel can look into your account history. Sorry I can't do more. 

This is what Premium gives you: 

• Premium users can set Triggers.
• Premium users see maneuvers that are currently selected by your opponents at the Battlefield.
• Premium users get Inbreeding Warning when trying to breed pets that are close relatives.
• Normal users can perform searches only among pets which are being traded. Premium users can search among all pets. This can be useful if you're looking for a pet with special traits and want to buy it from another Keeper who didn't put this pet up for trade.
• Premium users can search among their own pets.
• Normal users only see a pet's mother and father. Premium users have access to full genealogy.
• Premium users can instantly leave the island from any point of the map. Normal users need to move to the portal tile first.
• Premium users can send a group of pets to Arena and cancel all battle applications for a group with one click.
• Premium users can see their pets ranked for the current exhibition before applying them to the exhibition (valid only for exhibitions that don't have random parameters involved).

This account never had any other pets except the ones you have now. I checked your trade and gift logs, and no pets that were existing on your account have ever left it. To be sure, I also checked a few historical dumps, and it's same there. Although I found an account that have more pets and a very similar username. If you are the owner of that second account as well, I would like to remind that multi accounting is prohibited by our ToS. For the first time you may choose which account to leave and which one will be closed.

Oh my gosh, I am so sorry. I had no idea I had actually created another account here. May you please delete this one?