Bad Bad Bad present.....lol. The road is a worry, maybe let them go a little way, then entice them back with very tasty treats...... often. Btw I am in no way an expert, this is my first cat, so I am way over protective of my little girl....but 12 weeks still seems very young to let them go to far. How's the hunt for the perfect dog going....lol....you sound just like me...in for a penny...in for a pound! We have 4 dogs and now the kitten....never a dull momment here!!!! Did I mention the Parrot, the Degus and the snake?
Good luck.
Lisa x