I've long been aware of dogs that sniff out all sorts of thingsdrugs, cash, and morebut I didn't know that some dogs were specifically trained to sniff out digital devices.
These dogs are called digital detection dog, electronic sniffing dog, tech detector dog, sniffer dog or in french e-dog.
The number of these dogs is still very limited, and the use of such a dog is only considered in the context of a major criminal investigation.
One can imagine that if one day states want to confiscate all citizens' hardware wallets, the dogs will have a hard time finding them in Western homes crammed with home automation and electronics of all kinds. (but the dogs found devices in the case of Todd Jordan for example, they seem to be very efficient in fact)
Still, in France, we have between 2 and 5 digital detection dogs (including the famous Snatch), in the USA there are about 100 dogs, in Australia between 10 and 20, and in England between 5 and 10 dogs.
You can find various videos about how the dogs are educated and how they can find digital devices.
https://www.youtube.com/watch?v=GQOfza0iMH8