Not all dogs like the idea of riding inside a trailer that can get especially bumpy over uneven terrain. While you can always train your pet to ‘behave’ while it is inside the trailer, there will be instances when they’ll be very anxious. As such, it is a good idea to include dog toys as well as treats inside the bike trailer cabin to keep your pet occupied. That said, dog treats and dog toys should never be considered replacements for good ‘ol training, of course.