The short answer
A suitable grass hay when clean and properly dried; seed heads can be more calorie-dense.
Recommended amount
Offer freely when it is a proven, clean grass hay; fresh local forage needs gradual introduction and varied fibre sources.
Suitable rabbit age
Age and health needs vary. Young rabbits and adults may require different hay choices; ask a rabbit-experienced veterinarian.
Preparation
Wash well, identify correctly, serve plain and raw unless the guide specifically says otherwise, and introduce gradually.
Parts or forms to avoid
Avoid mould, dust and heavily grain-filled material for overweight rabbits.
Nutritional and feeding notes
Long fibre supports normal chewing and gut movement; exact quality varies by species, harvest and storage.
Review notes
Merck Veterinary Manual.
Educational guidance only, not veterinary diagnosis. Individual rabbits and local plant varieties differ. If your rabbit ate a questionable item or becomes unwell, contact a rabbit-experienced veterinarian promptly.
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