If you find that it is all lettuce, look at the Guinea Lynx Vegetable Chart it shows a variety leafy greens that Guinea Pigs can eat, but some may have to be rotated.
- Supporter in 2018
I'm still feeding my pigs red or green leaf lettuce, and I'm careful to rinse it well. (And yes, one of the cats steals as I'm rinsing it. I've heard of pigs stealing from pigs, but Pepper (cat) insists on stealing it from the pigs as well.)
And I'm still feeding fresh red or green leaf as well. I feel like they are better choices than Romaine anyway, because they have a lower calcium content.