I discovered this morning that he is walking funny. Kinda waddling like a penguin. He's never done that before. I dont know his exact age but this July will be 2 years since I got him
You should go to the veterinarian of exotics to examine it and see if it is a neurological problem, a tumor or a hypovitaminosis, among other possible causes. The veterinarian will be able to distinguish if it is the normal "popcorning" jumps and movements of the guinea pigs. This type of movement is characterized by a kind of sudden convulsion that makes them rise from the ground, taking off all four legs at once.
All the best,