Hay is the most important part of their diet. He needs large piles of hay available to him at all times as it makes 80% of what they need to eat in a day. Does he have that?
They can have one cup of veg per pig per day but you do need to build up new veggies slowly.
Safe daily veggies are lettuce, cucumber, bell pepper and cilantro.
Their pellets/nuggets are the least important part of the diet and they don’t actually need them at all provided they have a lot of hay and a good balance of veggies. They can have one tablespoon of pellets per pig per day.
This is our diet guide which will explain how to feed them.
Long Term Balanced General And Special Needs Guinea Pig Diets
You need to weigh him once a week to ensure he is eating a good amount of hay.
Very importantly, do you have two piggies?
Piggies must never be kept by themselves and must be kept in pairs.
If he is by himself he is going to get lonely and be very scared.
New Owners' Essential Information and Practical Tips Starter Collection
Companionship