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30. Brussels Griffon
The Brussels Griffon is a small dog you might think would suit retirement life. But these little ones can be notoriously difficult to potty train. And, let's face it, the last thing you want to do when you retire is clean up after your pup. According to iheartdogs.com, they are also "the ultimate Velcro" dog who will follow you everywhere and are prone to separation anxiety.