Final answer:
The Spanish proverb 'Watch out for the dog that doesn't bark and the man who says nothing' can be connected to Roald Dahl's short story 'The Landlady' as both emphasize the notion of appearances being deceiving.
Step-by-step explanation:
This Spanish proverb can be connected to Roald Dahl's short story 'The Landlady' because both highlight the idea of appearances being deceiving. In 'The Landlady', the seemingly friendly and harmless landlady turns out to be a serial killer who poisons her guests. Similarly, the proverb warns us to be cautious of individuals who may not display any obvious signs of danger or deceit.
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