Everyone is giving you good advice. You will know in your heart if it is time to get another dog.
If you are having trouble with the greiving process, as I can imagine you are, this is an awful blow. Please call your local shelter and see if they have any info on Pet Loss or contact a therapist or something. Just take care of yourself and your remaining beloved dog first.
I agree with Sammi, a wonderful site is
www.petloss.com to make a tribute to your Rainbow Bridge babies.