What are the two items his wife wants Mitty to buy?

an overcoat and dog food

a shovel and detergent

overshoes and a puppy biscuit

birdseed and an umbrella

The correct answer is: overshoes and a puppy biscuit.

Explanation:

Secret Life of Walter Mitty is a short story by James Thurber (1894 - 1961), published in 1939.

The protagonist of the story is Walter Mitty, who goes with his wife on a daily trip, to do some shopping and leaves his wife at the hair salon. She reminds him to buy overshoes (rubber rain buts) and puppy biscuits.

However, he's daydreaming about different heroic episodes, and because of that, he forgets almost everything, such us, what his wife told him to buy, which biscuit brand he should buy, etc.