Are you still hung up on this? Seriously animals get killed in fucked up ways all day everyday. From some of the food on your plate to old dying pets it's not always pretty.
Where's your bleeding heart for them? All you fucking gun fiends make me laugh so hard, one minute you're bragging about going hunting and killing animals and the next you're crying over some fucking dog getting offed. :a: Get a fucking grip.
Call the cops on him

Unless you're friend had a fucking dog fighting ring Micheal Vick style I wouldn't even be phased by this.
But hey, do whatever helps you sleep better at night
/rant