When you got your 2nd dog

Hi everyone! Well, Kylee is still really young (6 months old) but I am seriously contemplating getting another one in the future..probably when she turns 1 or so. But the main problem that is sticking out in my head is that I feel like I would be betraying her if I got another one . Has anyone else felt this way? I feel like she would be thinking.."mom, am i not enough?" I dont know maybe I'm a little but any input is appreciated.