They are exactly the same weight. I introduced them last week and it hasn't gone well, so they live side by side in a long tray divided in two sections. And since Tommy's diet is so unusual, it's best they stay close but not mixed together.
Tommy, according the former owner's notes only eats Romaine lettuce and celery. He eats unlimited Timothy hay and orchard grass. No water, no pellets and nothing else. I've tried carrots, sweet red pepper, parsley, cucumber, carrot tops. I may try kale and spinach. He formerly lived with two other pigs where they likely had unlimited access to those four above mentioned.
How can I supplement his diet? Syringe him a vitamin solution diluted? He doesn't drink water! Or is what he eats rounded enough. His eyes are very slightly crusty.
- Supporter in 2020
The crusty eyes would concern me. A newly adopted guinea pig should be quarantined for 3 weeks before meeting any other guinea pig in the household. That way, if there is an illness like an upper respiratory infection, or mites, you’re not spreading the problem to your pig.
I would consult an exotic vet for a checkup and start providing water and vitamin C.
Consider soaking a handful of hay in water for an hour or so, shake it out and offer it to him on a plate. Whatever is not eaten in a couple hours, discard (you don't want it getting moldy). If you find he likes this (many pigs do), you may be able to start slipping other very finely sliced foods with it. You could also take part of a romaine leaf and chop it finely, adding new vegs also finely chopped on top.
The crust eyes must be addressed first. Vitamin C is a very good suggestion. I doubt he gets enough from the romaine and celery.