try some of these
1.try putting some support on its feet so it feels safer
2.if it is shaking because it is cold try warming it up
3. there may be other animals around that may scare it so that mighty be why it is shaking
They are scared or cold.
because its scared of your vibration on the floor and how your walking
They are purring.
yes
because of blacks.
Yes they will get scared its not that they dont like you
He scared.
Because they get real scared.
scared
No they get scared and some times bite i love guinea pigs well hope this i help full from,guineapigpepper
Guinea pigs are afraid of vacuums for the first 4 or 5 times but after that they get used to the noise and they are not scared.
no, not all guinea pigs, Actually they are known to be not very "bitey", they usually only bite when scared and frightened.