Microchipping
This was another painful lesson that we are honestly a bit ashamed of.. But! We will eat humble pie and tell you anyway, just to warn you.
Our sweet puppy Hera had a chip, all neat and proper, but on day 1 we didn't think of entering the new address. On day 2, Hera suddenly vanished.
I can tell you this now: calling out to a dog who doesn't know her name yet is pretty much useless. But as persistent as we were, the whole neighbourhood had to hear us search for "Heeeeeraaaaaa". After hours of searching, the police called us back: Hera had been dropped off at the station by the bin men.
To make sure your found buddy can be reunited with you, you can have your dog chipped at the vet. The code is stuck into the passport.