You should at least check out
Destry Rides Again sometime. It is a Western, but not one of the stark psychological ones he did with Anthony Mann.
Destry is more of a comedy, practically an early parody of the genre. Marelene Dietrich co-stars (the Madeline Kahn character of Lili Von Shtupp in
Blazing Saddles is an hommage to Dietrich here). Jimmy Stewart plays Tom Destry Jr., the son of a famously tough sharp-shooting lawman. Junior is mild-mannered and drinks milk at the saloon...though it could be he's just as good a shot. Great movie.
And Jimmy reading his dead dog poem on Carson's
"Tonight Show" is a classic. He read others over the years, mostly humorous rather than sad. A
book of his poetry was published, called simply
Jimmy Stewart and His Poems, but it is long out-of-print. It includes "Beau", the one about his beloved dog. The book was less than 40-pages long, but it's a must for any hard-core Stewart fan. I'm sure one can find them on eBay and such.