When I added it did affect Tanks personality. For the better. But maybe if you want your little one devoted to you getting another might not be a good idea. Every once in a while I get jealous my babies are together and dont want me. But that moment passes and they want my love agian. My best friend is seriously jealous with her 2 dogs (weiner dogs), they dont really care to spend much time with her. They like each other better. I guess it will depend on the dogs personality too. Good luck in whatever you decide.
