Here's a breakdown:
* Safe in small amounts: Some varieties like romaine, red leaf, and butter lettuce can be given occasionally as a treat. However, it's best to stick to small portions and avoid giving it daily.
* Avoid completely: Iceberg lettuce is particularly problematic, as it offers little nutritional value and contains higher levels of oxalates.
* Better options: Focus on providing your guinea pig with a diet rich in Timothy hay, fresh vegetables like bell peppers, cilantro, parsley, and leafy greens like kale, spinach, and collard greens.
Remember: Always consult a veterinarian for specific dietary recommendations for your guinea pig. They can advise on the appropriate amounts and types of foods to ensure your pet's health and well-being.