Sure, life is hard and unfair. Bad things happen to really good people.
But look at Smog. He was was injured so badly in his early life that he'll never walk (or poop) without difficulty. This is just his daily norm. It's not like he's "overcoming" his problems. He's stuck with them forever. What Smog does is, and what we can all learn a lesson from, is have as much fun as possible. He may not walk normally, but that doesn't stop him from racing around the back yard with a crazed grin on his face. And when he's not tearing up and down our fruit trees, he's basking on his back, with all paws in the air.
Linguine, however, is unconvinced that anything about this little urchin has merit.