Strength
InuYasha's yōkai blood gives him superhuman strength. No upper limit has yet been shown in the canon, but, according to the Zusetsutaizen Ōgikaiden official character data book and an episode in the anime, he is at least strong enough to easily lift a boulder with a diameter greater than the height of his body over his head with one hand, and then run many miles with it. Such a boulder would weigh perhaps eight to ten tons. The Ōgikaiden similarly states that he is strong enough to punch through solid steel with his bare hands, as seen in the manga version of the battle with the Noh Mask.
Speed
While not as fast as Entei the yōkai-horse that served as Hakudoshi's steed, InuYasha's speed has been shown to easily exceed that of a normal horse; possibly as fast as, if not faster than, a cheetah. Due to the speed he can accumulate in his runs, added with his incredible strength, he is able to cross great distances with a single jump. Altogether, this creates the illusion that he is flying every time he leaps. The Ōgikaiden says he can reach the top of tall cliffs with a single leap as well.
Stamina
InuYasha's stamina likewise far exceeds human standards, possibly derived from the fact that his yokai blood is that of a dog, dogs naturally having great stamina. He is shown to be able to run tremendous distances at tremendous speeds with minimal effort, and is often seen complaining about how his comparatively weaker human companions always slow him down by needing to rest so much every day. He is also able to endure a great deal of physical pain, as was once demonstrated in an early battle with his brother Sesshomaru, when he continued to fight even after being impaled in the stomach.
Defensive Ability
While his fire-rat robe provides additional protection, a power afforded to anyone wearing it (such as whenever InuYasha gives his robe to Kagome for protection), InuYasha's physique is capable of taking a lot of damage, more than the average human, or even most yōkai. He appears unaffected by severe blunt force trauma, able to withstand a direct blow from a wooden log that broke on contact, and unfazed by the tremendous impact of being thrown hard enough to shatter solid rock. He also possesses tremendous resistance to sharp weapons, able to withstand attacks that slice through trees. While he can be injured by more powerful yōkai and holy weapons, he appears invulnerable to most human ones, able to catch normal arrows out of the air and break steel swords with his bare hands.
Even without his fire-rat robe, he has shown the ability to withstand direct contact with fire and tremendous heat, as well as corrosive substances like acid. When injured, he heals far more rapidly than a human, so much so that attacks powerful enough to severely injure him are rarely fatal, as they would be to humans, if they sustained an equivalent injury. For example, he recovered quickly from numerous serious attacks, including a large fist-sized hole punched through his gut. Unfortunately for InuYasha, his tongue is still susceptible to being burned by curry. He also appears weak against strong smells, as was the case with the ink from the episode "Cursed Ink of the Hell Painter".
Senses
InuYasha's senses are highly developed, and in some ways, appear to be super-canine rather than superhuman. His senses of hearing and smell are quite likely his most powerful — he is shown to be able to hear what people are whispering from great distances, as was the case when, while perched on a tree, he overheard Akitoki Hojo hiding in a bush and quietly praising Kagome under his breath. His ability to hear is sometimes used for comic relief, as when he overhears Shippo whispering insults about him to Kagome. Likewise, his sense of smell is shown to be extremely sensitive - he can smell hints of blood from miles away and can detect the presence of people by smell long before they can be seen. This is also sometimes used for comical purposes, such as in the episode "The Cursed Ink of the Hell-Painter" where he could be temporarily knocked out by the strong smell of the black ink.
Not much is explicitly said about his other senses. One can however speculate that his eyesight is somewhat enhanced at night, due to the fact that his eyes sometimes are shown to glow, and appear to share some characteristics with cat eyes. The fact that his robes are bright red (one of the colors dogs cannot see) suggest that InuYasha's visual spectrum is at least similar to that of humans. His sense of taste may also be heightened, considering how affected he is by curry.
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