Here are the AC/HP of everything at lvl 5 and 9:
Ape; 15/32, 16/58
Black Bear; 14/32, 15/58
Giant Badger; 13/30, 14/60
Wolf; 17/22, 19/44
Boar; 15/22, 16/44
Giant Panther; 16/22, 18/40
Giant Weasel; 17/18, 19/36
Giant Mule; 13/22, 14/44
The wolf is not that bad compared to that it seem to me...