It will be okay...just give it time. Our Wylie was 2 when we got our 2nd yorkie, Marcel. Wylie was definitely anxious, nervous, insecure, needy...for a good while...he didn't know what to think of this new "creature" in his house
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But with time, everything normalized. Give lots of attention and TLC to Beau, but don't overdo it either. Separate them when you're gone - that's normal for any puppy situation.