It's from 3 Days Grace - Pain. I've already learned how to play Animal I've become, but my girlfriend loves this song so I want to learn how to play it.

I've tried to use the pinky, but it just kills. Is the best way to just strengthen the pinky or what?

My Gear
Fender 60th Anniversary Standard Stratocaster
Washburn Lyon (LCT24)
Silvertone Revolver Bass
Ibanez IJV50 Acoustic
Fender CD160E-12
Guild Starfire IV
Some cruddy classical that my parents bought off ebay for like 40 bucks.
You mean the 1-4 stretch? Definitely use the pinky, it will be easy if you keep using it.
Just use pinky, you'll build strength in it and it's handy to have a strong one
Yep, pinky for sure.
If you don't use it, it'll just get in the way, and once you get it strong, a lot more things open up on guitar.

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You make me feel
Like a dog, you can see, my emotions
Is this for real, i'm a man
Sinking deep, in the ocean
If don't ever use your pinky for playing guitar, you will never be able to play some things in the future. Might as well start now.