Don't feel bad about getting a dog, you won't be replacing Josie!
the dogs in the pic's are very nice, and I bet you will know when it's time to get another dog! when my 2nd Rotti had to be put to sleep my parents didn't want a dog for about a month after that, but then we went to the shelter to donate some food to them. We saw this adorable Rotti pup, so we decided to take her though we almost didn't because my dad felt about the same as you but then we convinced him that he wasn't replacing the other dog so we decided to take her, our life was much happier after we brought her home and I don't think we could ever live without a dog now!