Interspecies Conflict/More fights
Fighting bull 1500lbs vs 1500lb polar bear
Jaguar vs wild boar
Jaguar vs 450lb gorilla
Siberian tiger vs 500lb gorilla
Siberian tiger vs 550lb grizzly
Fighting bull 1500lbs vs Cape buffalo 1500lbs
Hippo vs great white shark 15ft water
Japanese Akita vs Chacma baboon
Japanese Akita vs chimpanzee
Japanese Akita vs mandrill
Siberian tiger vs 2 hyenas
Fighting bull (1,500lb) vs Polar bear (1,500lb): This will be a close fight. Polar bears aren't accustomed to tackling large, mobile adversaries larger than a muskox, but possess incredible strength in their bodies. Fighting bulls are muscular & powerful as well, and can make violent, forceful thrusts with their forward-pointing horns. The bear won't have the mobility to avoid the bull's attack, but will be able to hinder the bovid's movement with its huge forelimbs (and how well it can do this will be key). The polar bear's endurance will enable it to wear the bull down if it can hang on long enough (and avoid serious injury). Edge to polar bear.
Jaguar vs Wild boar: The jaguar will weigh close to 80% of the wild boar's weight. Wild boars can be very dangerous (have sharp tusks & can make quick turns), and have tough hides that afford them protection from many attacks. Jaguars are among the strongest cats pound-for-pound, and have vice-like jaws capable of crushing turtle shells (and puncturing skulls). This adaptation gives the jaguar a unique weapon in its arsenal. The big cat's short, stocky build is perfect for engaging & controlling low-to-the-ground adversaries, and it will need to use its paws to grip onto the wild boar's front half to neutralize the slashing tusks of the suid. As the smaller peccary (a wild boar-like animal) can give a jaguar fits, the felid will need to be extremely careful with a boar larger than itself. A jaguar would probably avoid a wild boar in a normal encounter (and seek easier prey), but will have a decent chance if it's determined to tackle the pig. Close to 50/50.
Jaguar vs Gorilla (450lb): The jaguar can weigh close to 3/4th the gorilla's weight. Jaguars are the strongest cat pound-for-pound, and they have stocky bodies with short, powerful legs. Their bite force is high enough to pierce turtle shells & caiman armor, and they typically bite through a victim's skull to dispatch it. Gorilla are muscular animals with strong bites & powerful clubbing forearms. Gorillas aren't accustomed to taking on large animals of another species. An angry gorilla might succeed in intimidating a jaguar into a retreat on some occasions, but a jaguar intent on completing a kill will be able to do so more times than not. The jaguar's bite, claws, & killing experience will be enough to overcome the gorilla's size & strength. The cat will close in on the gorilla and use its agility & quickness to find a good location to sink its teeth into. Jaguar wins.
Siberian tiger vs Gorilla (500lb): The Siberian tiger will weigh over 30% more than the gorilla, and will easily outmatch it. Gorillas are typically peaceful, and aren't used to confrontations will animals of a different species. Tigers are practiced killers of large game, and many of the tiger's prey items are much more formidable than a gorilla. The gorilla is strong, but it won't be able to prevent the Siberian tiger from using its paws & claws to gain a favorable position to land a finishing bite to the ape. Big cats are quicker & more agile than gorillas, and have superior weaponry. Siberian tiger wins.
Siberian tiger vs Grizzly (550lb): The Siberian tiger will have a small weight advantage (20%) over the grizzly bear. The grizzly bear will have the usual advantages that bears enjoy over similar-sized big cats (strength, endurance, durability), but the tiger will have advantages over the bear (quickness, agility, finishing experience). The key to this battle is whether or not the tiger can secure a finishing bite (typically a throat bite) before it fatigues or sustains serious injury (from swiping claws/bites). A Siberian tiger with this weight advantage should prevail more times than not, but it won't be easy at all. Edge to the Siberian tiger.
Fighting bull (1,500lb) vs Cape buffalo (1,500lb): Cape buffaloes have thick, curved horns that point down & then up, and the base forms a shield of bone (called a boss) to help shield the skull from injury. Cape buffaloes are ill-tempered by nature (and can't be domesticated), as they have to deal with attacking lions, hyenas, and African wild dogs. They have been known to kill lions in confrontations, and it usually takes multiple lions to bring one down. Fighting bulls are very well-muscled in the neck, shoulder & back areas, and have sharp, forward-curving horns that are in great position to impale an attacker. These bulls can make violent, powerful movements, and are typically very aggressive. It's hard for most domestic animals to compete with a wild one that deals with the kind of adversity it faces, but the nature of what a fighting bull does puts it on par with many non-domesticated animals. At equal weights, this fight is 50/50.
Hippo vs Great white shark (15ft water): A hippo can weigh more than a great white shark (by 20% or more), but it will be in trouble here. Hippos aren't swimmers (they move about in deeper water by walking/bouncing along the bottom) and will have serious mobility issues in 15ft of water. The great white shark's bite can create a massive avulsion with one chomp, and its mobility in the water will enable it to pull this off quite easily. The only way the hippo can win is if the shark haphazardly swims close to the mammal's huge jaws. The hippo is too much out of its element here. Great white shark wins.
Japanese Akita vs Chacma baboon: The Japanese Akita can weigh over 45% more than than a big chacma baboon (and twice as much as a typical one). In the past, Akitas have been developed as fighting dogs and hunters of large game. They are heavy, courageous & wary, have powerful jaws, and make excellent guard dogs. Chacma baboons are sturdy primates with long, upper canines than can cause serious injuries to an attacker. The baboon's use of hands & mobility will help it here, but it will have problems dealing with the big bite of the dog. This could go either way, but a large 90lb chacma baboon should have the edge. Close to 50/50.
Japanese Akita vs Chimpanzee: These animals will weigh about the same (although some chimpanzees can get bigger). Chimpanzees aren't adept at dispatching similar-sized animals solo, but frequently use aggressive displays to intimidate rivals. The Japanese Akita's big bite will certainly be an issue for the chimpanzee, but the ape's strength, mobility, use of hands, & decent bite should be enough to deter the attacking dog. The chimpanzee won't be able to kill the Akita, but should put up enough resistance to drive it away. Edge to chimpanzee.
Japanese Akita vs Mandrill: The Japanese Akita will weigh almost 30% more than the mandrill. Mandrills are the largest of all baboons. The mandrill's sharp upper canines, mobility, & use of hands should enable it to trump the Akita's big bite on most occasions. Mandrill wins.
Siberian tiger vs 2 hyenas: A Siberian tiger can weigh more than 4 spotted hyenas. Hyenas are durable & have bone-crushing jaws, but 2 of them will easily be dispatched by a Siberian tiger. A male lion can hold its own against 5 spotted hyenas, and the Siberian tiger is larger than a male lion. Even a smaller Sumatran tiger (less than half the weight of a Siberian tiger) will overpower 2 hyenas. Siberian tiger wins.