Dog Always Has Body Odor?
Body odor on animals is from the animals diet not like humans that sweat, try a different diet for your dog ,give it about one and a half weeks and see what he/she smells like .
Replacing a Mailbox Post?
If you can get some large spikes driven into the wooden post and get a pry bar to try to pull the post out of the metal tube you should be able to replace just the wood post.