Gustavius Boles

Dr. Gustavius Boles is a fictional character from the book 93 Million Miles in a Balloon.

Physical appearance
Gustavius Boles is a yellow anthropomorphized dog with a small golden brown moustache, a brown jacket, brown flying goggles, a black bobble hat, and a white ascot.

Personality
Boles seems to like to keep an air of mystery to him, and as such he dislikes inquisitive people, which he calls "questioners". He is also shown to be very skilled in his balloon.