In the photo above is Bazz, a black labrador that beekeeper Josh Kennett has trained to detect by smell a serious bee disease called American foulbrood. The Paenibacillus larvae caused by the infection are usually only visible under high-magnification microscope, but thanks to Bazz, that's not necessary.
Microscope analysis might not be needed thanks to Bazz's nose, but the dog still had to be protected from bee attack to get close enough to sniff out the hives. That's why Kennett built this protective suit that makes Bazz look a big like a canine astronaut.
Beekeeping dog in 'astronaut' suit detects infected hives by smell (Treehugger)