Worst Things About Dog Ownership

What are the worst things about owning a dog? A recent pool by ThePetPlace.com listed these responses:

Here are the Top 7 things on the "Worst" list:

1. Having to Board / Get a Pet Sitter When Traveling
2. Pet Hair
3. Cost of Medical Care
4. Inappropriate Urination
5. Barking or Whining
6. Aggression
7. Pet Odors

What gets you down about dog ownership?