I park my pets at the top right on other side of tunnel corridor North side where it's safe...both Spider and Wolf. This happened at 1/7/16 at 23:02-3 Game Time abouts. 
Training at Snow Dragons, when a Dragon had walked by the Tunnel, all of a sudden my Wolf jumps from out of know where attacking it lol and gets himself killed in the process...this has happened like over 3 times and finally thought to report this as a bug, cuz in no way were either of the pets in danger. It is strange lol but frustrating somewhat of losing your pots and items over it as well as a pet. Perhaps, you might be able to look into it. LatersSincerely
Crescent Q
Forgotten Tales 