Yipes. Sorry to hear that Shadow. We had to put the dog in my avi down about 4-5 months ago and it was one of the toughest things I've had to go through. I still get emotional thinking about her.
I too worked out that day with red and puffy eyes.
I know all about putting a dog down.....I had to put mine down just about a year ago....I'm still not over it, the first 2 weeks are TOUGH, it gets easier, but ya still miss them.
So VERY sorry to hear about your dog, S...... Understand your feelings - had to put my oldest cat down last March & I still miss her..... Animals are blessed to cross over the Rainbow Bridge - you'll see him/her again.....
Thoughts & prayers are with you and your friend & their father.....