There is a Spice & Wolf Manga if you are wanting that Joel who posts here does give the manga high praise.
I can't recommend the manga enough. Just a fair warning though, the manga is way behind the light novels.
The first three volumes of the manga cover the first volume (aka arc) of the light novels, while the second arc took another three volumes to complete. Volume 7 jumps to arc 4, since arc 3 isn't really that important.
The anime covers the following arcs/volumes of the light novels.
Episodes 1-6: Volume 1
Episode 7: Original Episode
Episodes 8-13 (and episode 0 of season 2): Volume 2
Episodes 14-19: Volume 3
Episodes 20-25: Volume 5
The anime skipped volume/arc 4 of the light novels due to budget (a lot of action) and it's considered to be the best out of the whole series.
Note: Each volume of the Light Novels is considered as an arc.