I am a bit concerned because for the past few weeks one of my guinea pigs has suddenly started aggressively chasing one of my other piggies. I had 3 guinea pigs for about 2/3 years, and I recently introduced a new one that was about 6/7m old. This introduction was about 2 months ago, and she fit in perfectly fine with the rest of the girls. She was very timid and left everyone alone, and no one bothered her either. However, about 2 weeks ago I had to quarantine my alpha piggy for an illness, and the problem piggy started this behavior. I asked my vet if I could treat all of them and put the alpha back in the cage to avoid the fighting, and this is what I wound up doing. However, ever since then the new girl has continuously chased and bullied one of the others. The girl being bullied does not fight back and just runs away and cries, and I am concerned about why this behavior suddenly arose. It is getting to the point where it is consistent enough that I am getting irritated because she is relentlessly bullying her. Is this normal? Is this temporary? Why did it only now occur when they were fine for a while?
P.S. They are all female and live in a 2x8 C&C cage
P.S. They are all female and live in a 2x8 C&C cage