Possibly the gorillas, but fights between these two animals are very rare since gorillas and oxen are herbivores and will leave each other alone.
Most likely the gorillas.
2 gorillas are very strong and powerful enough to kill an ox, so the gorillas will definitely win.
It is likely that the hippo would win this fight. The 5 dogs would not be surprised that the gorillas would kill them by either hiting them with stones and sticks. When the 2 gorillas defeated the dogs by throwing sticks, the 2 gorillas may throw stones at the hippo, but this would only make it want to fight more. The hippo would come to grab the gorillas with its large jaws and crunch them to death.
Most likely the 5 gorillas will win. After the ox fights the 10 dogs, it would be killed by the dogs. Then, the gorillas can kill the dogs easily by charging at them or grabbing and throwing sticks or stones at them.
The 15 gorillas because they would all throw heavy stones at the elephant.
Bear. Bears are predatory by nature. Gorillas are not, and thus can be seen as prey by a bear.
gorilla because it would grab it and slam it into the ground
It's likely the gorillas may win this fight. The reason being is that the dogs will attack the cow (or bull) from all sides, a couple distracting from the front and the others closing in from the back. When the cattlebeast is down and no longer able to fight, then the dogs take on the gorillas. However, a couple of male gorillas will be more than what the five dogs expected, resulting in them either being pelted to death by the rocks and sticks thrown by the gorillas, or chased off by the bluff charges.
Gorillas are apes.
An AT-AT would definitely win.
carcharodontosaurus would win
...ta.rzan would win