He is very cute. We got Griffin when Bentley was 6 months old and it was the best thing we did. We love having two and wouldn't have it any other way. Here are the only cons I can think of: It's harder to walk two dogs (especially when they want to go in different directions - it takes more training and patience); It's harder to carry them into stores with you (although louisdog makes a dual carrier that I love and they both fit in it); It's harder to monitor how much food they eat and make sure one doesn't eat too much while the other does not have enough; You also have to make sure they both get the attention from mommy that they desire; It also does cost more (but you can decide how many t-shirts, bags, treats, etc. you want to buy - I tend to go overboard and need two of everything
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Aside from those items, having two is wonderful and has greatly helped their separation anxiety. They are also great playmates. We use to run around the house to play with Bentley in order to wear him out. Now he and Griffin play chase and wrestle multipe times a day. It's great fun! Good luck with your decision. And don't worry, as much as they will love each other, they will always love you the most and know that you are their mommy