So I ran into this strange bug today. I started training my Roc http://beastkeeper.com/pet/44539

I realized I actually wanted to do something else with him, so I canceled the training. My planning didn't work out though, so I just started the training again.

Now when I checked my reports I got this:

I'm not complaining about this, just figured this sounds like a bug you could abuse to (almost) instantly level your pet to whichever level you wanted - if I understand this correctly, just cancel and restart trainings until the pet would end up at your desired level - and if I'm not mistaken all at the cost of the one level. I don't know if it would work like that, but potentially, I might be able to start and cancel training of a lvl 1 pet 49 times and after 4 hours and 49 times the lvl 1 training fee, it would be lvl 50?

I figure it's at least worth looking into :)

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EDIT: 

I just tested this some more. I repeatedly started and canceled a training sesstion for this pet: http://beastkeeper.com/pet/86240

In my reports it now says: 

So yes, in theory you could level a pet from lvl 1 to 50 in 4 hours at the cost of 3920 silver (80s lvl 1 training fee x 49 levels). 

I notice this was posted a while ago, yet has not responses. I think I may have had the same thing happen a few days ago, but I don't know how to confirm it. Has this issue been addressed yet?

I just tested it with my lowest level pet, Sepia Sigil, who had nine experience to get to level five. Whatever the problem is, it's not (just) on Timain's end. I successfully paid 72s three times to level three times in four hours, though I still don't know how to check my "reports" to confirm it. If I've got my math right, it should have cost me 952s where I only paid 216s; the difference would be exponentially larger if someone took extreme advantage of this. I fully expect to have the money manually pulled from my account later on, but I wanted to see if this had been addressed yet.

Though I did note, it listed the level as having increased multiple times, but the base stats (Strength, Agility, and so on) only increased once. So while this glitch could be used to take a pet up to 50 really fast for relatively little time and money, the only benefit would be the bonus to offspring for being bred by 50th level parents. And that bonus is significantly less than the bonus of breeding a pet that has high stats and a low level, anyway. So really it's a waste, which they'd deserve for cheating in the first place.

I have a problem that is probably related to this bug.

My pet Gladelicous is stuck in battles, and I can't cancel her out from either the battle page or the pet profile page (No fighting status in pet profile either). I had put her in the riding hall, but I canceled that riding hall training midway to put her in battles. 4 hours later I get a surprise level and her status gets reset to Active/No Effects - Except I'm still on the battling list, and now I can't get out.

She shows up on the fighting page, so I assume people can still fight her. I expect that she'll be freed when her energy hits 0 lol.

Thanks for reporting.

This is the known bug with double status which has been reported a lot of times in other threads. We're aware of it and still trying to locate it, sorry.
Please report stuck pets by writing a message to me or Voron_eril to get the fastest response. This problem can appear with any status (usually reported as double pregnancy).

Aelisk, I removed "Fighting" status from your pet.

Sorry for the inconvenience.

The bug with continued "ghost" training after cancelling is fixed. Please report if you will face additional issues.