Big Mama: Oh boy, these old wings ain't what they used to be. Big Mama, you better lose a few pounds.
Adult Copper: I think I did a good job tracking down those varmints for ya.
Chief: Trackin' an' smellin' ain't enough. You gotta think nasty.
Widow Tweed: We met it seems, such a short time ago. You looked at me, needing me so. Yet from your sadness, our happiness grew. Then I found out, I need you, too. I remember how we used to play. I recall those rainy days, the fires glowed, that kept us warm. And now I find, we're both alone. Goodbye may seem forever, farewell is like the end. But in my heart's a memory, and there you'll always be.
Young Copper: If you give me a headstart I can beat you.
Young Tod: A worm for breakfast? Yuck.
Adult Copper: Tod, if it's the last thing I do, I'll get you for this.
Big Mama: Listen good, Tod, 'cause it's either education or elimination.
Adult Copper: Tod... I don't want to see you get killed.
Answer: Since we don't really know how he died, he could have drowned and not died on impact. Bear may not have been a strong swimmer or sustained too much injury from the gunshot to swim to the surface. However, in physics, force = mass * acceleration and thus larger creatures will hit the water with greater force than small creatures (as the old cliche goes; the bigger they are, the harder they fall). So it's possible for Bear to die on impact and not Tod because of his larger size.
Bishop73