You can't be too careful when it comes to choosing a pet sitter. Some pet owners choose to save money by having friends, family members, or neighbors look in on their pets. Others hire "hobby pet sitters," who advertise pet sitting services but don't have a business license, insurance, or (sometimes) any animal care or first aid credentials. Savvy pet owners, though, go the route of hiring a professional pet sitter, like the sitters at Boulevard Bark. Professional pet sitters are individuals who make a living looking after animals. You...