There will be mixed opinions but I believe that you know what is best for you and your family. If you are willing to take on the responsibilty of essentially having 2 puppies then I think you will be fine. But only you know that. Some want years betwen their dogs, and others want at least a year. I have always had 2 of the same aged dogs my whole life until now and I think it's purely based on the potential parents. Just know that it is extra responsibility and you need to make sure that you are getting the other puppy for you not your other dog and you are willing to take the necessary measures for both dogs if you need to.