A Physiological Question

So, we are basically physically made up of the same stuff as animals like dogs and cats, right? I mean, there's the whole biped v. quadraped thing, but we all have bones, muscles, tendons, ligaments, etc...so how come when I'm watching Animal Planet I never see a lion running and about to pounce on a gazelle's back pull up lame, Ken-Griffey-Jr.-around-third-base-style, with a pulled hammy?
And if we're made in God's image, does He have the same problems? Is this why She needed to rest on the 7th day, did He throw too many pitches on the 6th day and hurt his arm? Was Dusty Baker somehow to blame? Is God better now? Did the Lord Almighty have Tommy John surgery? Or did the overexersion end His career as a world make? Is this why we haven't found life on any other planets?