The language of their country, I suppose, unless you're referring to the smattering of Latin terms interspersed within the jargon of their professions.
What kind of formulas do doctors and/or nurses use throughout their career? ^^how is that an answer??
doctorsdentistspharamcistslawyers
Spanish. Very few people beyond doctors and lawyers use Latin.
forceps
PC is the abbreviation of Professional Corporations. This designation is for corporate use by licensed professionals such doctors, lawyers, accountants, and engineers.
Trumpet
They're using a narrative style.
Cuneiform.
No, dogs do not use language of any kind. They communicate in other ways.
Metaphor
Yes, cinema can be viewed as a kind of language because it communicates stories and ideas by its use of moving images.
Sign Language has been taught to some apes, but beyond that, animals do not use any language.