Seen on Seventh.
Wolves can stick around if wolf form is interrupted by that auto-renewing bug. They disappear if wolf form is manually de-activated, or expires due to lack of MP. So, presumably, they should never be around without it.
Wouldn't matter if not for the other bug. But given that exists, you currently can fairly reliably keep your wolves if you end your AP cycle with plenty of MP. Easy to do if you like to finish targets with Mantle of Vrykolakas to keep fueling your wolves. Even if you're not trying to exploit the bug.
Wolves without Shadow of the Wolf
Re: Wolves without Shadow of the Wolf
Since the underlying issue is so resistant to all our attempts to fix it (see here for more) in the next patch there'll be some code in the AP tick that eliminates Wolves attached to a summoner without the Shadow of the Wolf status active.