Demon Buer is described in several old Grimoires. In this post you will find descriptions of Buer from several sources.
Demon Buer: Pseudomonarchia Daemonum
Buer is a great president. He teaches philosophy and also logic.
This demon helps you to know the properties of herbs and he gives good Familiar spirits.
Buer can heal all diseases. He rules 50 legions of spirits.
Source: Johann Weyer, Pseudomonarchia Daemonum
Goetia & Daemonolatry Goetia
Buer can teach you philosophy, the logical sciences, and also the properties of herbs and plants.
Both the Goetia and the Daemonolatry Goetia tell us that Buer can heal all distempers in us.
Buer can give you good advice about when to use magick and when to not.
Moreover, Buer gives good Familiar servants. Finally, Buer rules over 50 legions of Spirits.
Source: Goetia & Daemonolatry Goetia by S. Connolly
My own experiences
Demons are suitable doctors even for animals. The best demonic pet doctors are:
Buer (he heals depressions in animals)
Marbas (he heals physical injuries in animals)
Ipos (he heals phobic behaviours in animals)
Heramael from Grimoirium Verum (he teaches how to heal animals and humans and also heals all diseases)
I have done spells with Buer for my pet when my pet was depressed. Buer made my cockatoo start to talk once again after a long period of silence.
Buer can heal depressions in humans too.
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