They can but it depends on your dog's nature, if it is VERY friendly then yes just watch them very carefully for the first couple of times until they recongize and enjoy each other.
ONLY if the dog is very careful and gentle natured. Watch them for a bit to make sure that they get along well.
Yes they can it all depends on the nature and personality of you dog like if it is well natured,very gentle,and careful then it shouldn't be a problem.But if your dog is not good natured and has been in many abusive homes and isn't gentle and barks a lot then I would suggest not to get the guinea pig or to get rid of the dog :)
I want a guinea pig but I have a dog and I fear that something may happen to it...is this a risk to be took?
Yes they can but it depends on the type of dogs westies can't be near them but mongrels can go near them???