Decided to go for "fun" look.
Since the targeted audience are people who like dogs and animals enough to want more than one dog, I wanted to make something to make them go aww or for the cover to look as playful as happy puppy.

1) Used handwritten font
2) Used Orange color, which usually associated with excitement, be energetic and warmth.
So, I thought it fits a book about dogs.
3) And I let puppies to have fun on cover, interacting with the title.