How much fruit and vegetables is he eating? Guinea pigs need a diet which is 80% hay. They are not like us and can put on weight due to too much fruit and vegetables. I feed mine two portions of vegetables a day and fruit now and then as a treat.
I've never had a really big guinea pig until i adopted my Sheltie piggie Morrisey and even then i think thats just all hair! They do look cute though with a little chubby face (all serious dieting issues aside)
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