We got our second dog 3 years ago, and I love having two as well. We also went through a period of re-adjustment while the older one basically used to sit staring at me while the newcomer misbehaved, as if to ask 'WHY, DAD, WHY???'.
This was them when we got her...
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....and more recently
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The rescue place told us the second one was a Jack Russell cross. She weighs 50 pounds.