Straydar: noun, (stra-dahr): The unintentional ability to spot stray or unaccompanied dogs or cats when driving, walking or during one's lunch hour at work, prompting the need to always have a leash and pet treats in the auto. This may also include the ability to have pets brought to one by others who are aware one has this ability. There is no cure once one becomes afflicted with "straydar".
It never fails that when I'm driving somewhere my straydar goes off and I spot a dog or cat that is running, looks lost, or is injured. I was born with straydar and it only gets worse as I get older.