About 4 months ago I adopted two baby guinea pigs that were born around the same time (but different mothers). They are both boys and have been eating, drinking and exercising very well. Their names are Tony and Kevin for reference. Tony is at least an inch bigger than Kevin even though they have the exact same diets and housing situation (2X4). They are coming up on 8 months old so I'm concerned that there might be something wrong with Kevin? I don't know what it could be because he shows no signs of sickness at all. He is a very active and lively pig that always wants attention. The only thing I've noticed with him is he always has his head slightly tilted to his left. Both of them are Abyssinian. We always joke about him having dwarfism... but is that even possible? I really have no idea, but as long as he's happy and healthy I'm happy. For context on their diet they get orchard grass hay, alfalfa hay, oxbow young guinea pig pellets, vitamin c treats, and assorted vegetables like lettuce, carrots, bell pepper, etc. I have access to an exotic vet so if you guys think I should have him checked out please let me know!