Your pup may be older than you think. Another reason to let sleeping dogs lie.
Travel can come with danger, so dogs have mostly evolved to avoid being over-adventurous. That said, dogs may see some kinds of travel as a chance to find things they want -- like food or a mate.
Based on his age in 'dog years,' could your animal pal legally buy alcohol? Or would he be cashing in on his senior discount? Veterinarians are more interested in life stage than a particular number.