Companion 1 goes along with the first five Sonrise Stable books. Companion 2 is for books 6 to 10.
The first guide is 188 pages and the 2nd, 222 pages. They're 8.5 x 11, spiral bound, and designed to be written and drawn in. There are an assortment of activities in each guide. Check out the pages for each to see a video, description of contents, and sample pages.
Something that makes these activity books unique is how the drawing lessons and activities, such as the 3D paper horse models, connect to the characters in the books. Each book has a strong Christian theme. Those are reinforced in the Companion guides with Scripture art for the theme verses. Readers are encouraged to memorize the verses and many of the questions suggest searching Scripture for answers.
If you lean a little to the unschooling side, the series plus the Companion guides could easily become a horse-themed curriculum or unit study.
Or just read them for pleasure!