Rough Weather Ahead for Walter the Farting Dog, by William Kotzwinkle. (Dutton Children's Books, c2005). When an expert on animal gas tries to cure Walter, his farts keep building up until he floats away and is blown by the wind to a distant place, where he once again proves himself a hero.
The Fox Wish by Kimiko Aman "...With beautiful, classic illustrations and lyrical text, here is a subtle, sensitive piece of magic that proves to sisters, brothers, and foxes alike that the trusted familiar often lives right next to the truly extraordinary—if only you have the eyes to see it." https://www.amazon.com/dp/1452151881/ref=cm_sw_r_pi_dp_x_ETgXybEBN9WCJ