Themes: Military, Dogs, Heroes, Nonfiction, Tween. Not all soldiers walk on two legs. There are dogs in the military. They fight for our country alongside human troops. Protecting troops by sniffing out bombs is a big job. These dogs save lives. Red Rhino Books Nonfiction is the first Hi-Lo children's nonfiction series at a first-grade reading level for students in grades 4-7. Visually appealing fullcolor photographs and illustrations-along with fun fact boxes-keep these books flowing. Also includes prereading comprehension questions along with a 20-word glossary for further reading support.