Unfortunately, last year, I also joined the "I completely understand, because I've been there" club. My little angel, Jesse, suffered a brain aneursym on the 4th of July, and the next day, my best friend was given her final shot to return home to God. That was THE HARDEST thing I EVER had to go through in my entire life! But like other people on here told me, and I'm telling you now ~ the pain WILL ease day by day. Just like all of us, you will always miss Buddy, but you will always have your memories.
If you haven't been there yet, check out: http://www.rainbowbridge.com/. It's a great resource for people who have just lost their loved one. It has stories from other people in a similar situation, poems, memorials, etc. I think it might be a good help for you right now.
Ecclesiastes 3: 18-22
I also thought, "As for men, God tests them so that they may see that they are like the animals. Man's fate is that like that of the animals; the same fate awaits them both: As one dies, so dies the other. All have the same breath, man has NO advantage over the animal. Everything is meaningless. All go to the same place; all come from dust, and to dust all return. Who knows if the spirit of man rises upward and if the spirit of the animal goes down into the earth"?
A very touching posting and my condolences.