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.
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 .