Should I take my mom's dog?

So last year my step dad got a puppy that me and my mom didn't want. I was at home with him and another we already have and I got frustrated. My mom jokes about when I move out I'm taking both dogs and I'm like I'll take the first dog. The first dog is chill and goes to people. The second one is aggressive and barks/snaps at everybody even me at times. I care for him but I'll just leave him at my mom's
Should I take my mom's dog?
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