UD has some smart analysis of the ‘mirror test’ for self-awareness. Some researchers found that a fish was able to distinguish its own face from other similar fish faces in a picture.
Good question:
Researchers have also questioned whether the test is appropriate for species like dogs that rely more on scent, or like pigs that may not care enough about a mark on their bodies to try to touch it.
The canine view of vacuum cleaners suggests a possible mirror test. Dogs see vacuums as demons because vacuums suck up all the individual precisely tuned scents from their precisely remembered locations, and roil all the scents into a confused fast-moving noisy mass, like social media.
A mirror test would need a set of small hoses. A dozen dogs are in separate cages or rooms. Each dog, including the one being tested, has one inlet near its butt. The outlets of all the hoses are in front of the dog being tested. Open each outlet in random order. When his own butt is being sniffed, does he turn around and check?
Polistra's Mill 