We brought our piggies (Elsa and biscuit) home 2 weeks ago and seem to be settling in well. I have noticed that there is a lot of growling, slow waking and vibrating going on between them more now than when they first came home however have usually it’s one or the other doing it. I think biscuit is the more dominant seems to explore more and seems to do the shaking thing more often. Elsa is quite flighty and still a little unsure. But the above behaviour they are both doing it and going close to each other bums and sometimes they look to be popcorning. We have a two tier cage so they can get away from each other if they need to and we have just got an outdoor run which they love. Is this behaviour normal and how will I know if there not getting along?