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1.
A colloquial expression used to describe different levels of either temperature, moods, physical appearance, etc...
1. Damn...he's hotter than a dog's ass!

2. It's hotter than a dog's ass in here!

3. The boss is madder than a dog's ass right about now.
by Ms. MJKeenan October 16, 2003
 
2.
A way to express the fact, the pipe you are smoking with friends is empty, and only ash is left. Other examples: beat or dead.
I can't believe you handed me this bowl to smoke...It's a dog's ass!
by Rushtag August 22, 2005