Agreed. I used a shovel. Quick and effectiveThat's just cruel.
I agree, kill it, but there is absolutely NO REASON at all to prolong suffering like that. Kill it, but be a good person and don't try to make its death as painful as possible. A gunshot, a clubbing, a shovel - any of these are faster and more painless than slow suffocation, whether it's via your "box" suggestion or drowning.
Sure, kill it - but there is no reason to be cruel like that.