My existing adult guinea pig was bereaved and we have a new baby guinea pig called dot to keep her company. Dot is about 8 weeks old, she is about a quarter the size of an adult guinea pig. (Will try to post a pic!) She is understandably nervous and if startled she just runs around randomly. I have tried putting her in the run on grass with our older guinea pig but she just hid. I probably started a bit soon as she has only been with us a week. Would you persevere or wait a few weeks? My other guineapigs have loved being on grass so I don't want her to miss out!