Quick answer
Cucumber may fit only as a tiny occasional amount for rabbits. It should not replace the normal diet.
Use a tiny occasional amount only. This should not become a daily food.
Vegetable safety check
Can Rabbits Eat Cucumber?
Cucumber may fit only as a tiny occasional amount for rabbits. It should not replace the normal diet.
Preparation
Wash and slice thinly.
Watch-outs
Watery foods should be introduced slowly.
Why this answer changes by species
Rabbits usually rely on grass hay. That makes cucumber different from a generic human-food answer, especially around sugar, starch, seeds, animal protein, and sudden diet changes.
Related foods for rabbits
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Sources used
FAQ
Can rabbits eat cucumber?
Cucumber may fit only as a tiny occasional amount for rabbits. It should not replace the normal diet.
How should cucumber be prepared for rabbits?
Wash and slice thinly.
What should I watch for with cucumber and rabbits?
Watery foods should be introduced slowly.