Gemma, her mother Summer, and her half-brother Samwise are all naughty, silly corgis! My quasisister who has Summer and Sam has had all sorts of issues with them going walkabout (rather, runabout) instead of staying in their yard; Gemma's found ways to wiggle under my fence, even losing her harness to do so, and goes off to find cats and garbage, and won't come when she's called at all (gives me heart attacks, I swear).
Gemma's and Sam's tri sister and blue brother would never think of doing this!
Diane and I say it's a Brindle Thing - what do you say?