While dogs can't voice their opinions, they can make their views on a topic known through their facial expressions and body language. Many owners let themselves go in front of their pets because it's not like their dog is going to tell anybody if they haven't showered for days, or if they didn't wash their hands after visiting the bathroom.
But research from Kyoto University, in Japan, shows dogs judge 'incompetent' humans and naturally gravitate towards those able to fulfil tasks for them. However, this only applies to female dogs, with most males none the wiser if their owner makes a mistake in front of them.
