Quick answer
Apple may fit only as a tiny occasional amount for guinea pigs. It should not replace the normal diet.
Use a tiny occasional amount only. This should not become a daily food.
Fruit safety check
Can Guinea Pigs Eat Apple?
Apple may fit only as a tiny occasional amount for guinea pigs. It should not replace the normal diet.
Preparation
Remove core and seeds.
Watch-outs
Fruit sugar adds up quickly.
Why this answer changes by species
Guinea Pigs usually rely on grass hay plus vitamin C produce. That makes apple different from a generic human-food answer, especially around low-vitamin treats, sugar, dairy, and animal protein.
Related foods for guinea pigs
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Sources used
FAQ
Can guinea pigs eat apple?
Apple may fit only as a tiny occasional amount for guinea pigs. It should not replace the normal diet.
How should apple be prepared for guinea pigs?
Remove core and seeds.
What should I watch for with apple and guinea pigs?
Fruit sugar adds up quickly.