P.E.T. redirects here.

Pet generally refers to a companion animal. PET may also refer to

• a person:
• Pierre Elliott Trudeau, former Prime Minister of Canada

• something in medicine:
• Patulous Eustachian tube, a medical disorder affecting the middle ear
• Positron emission tomography, a medical imaging technique
• Pre-eclampsia, a medical complication of pregnancy

• something in science:
• pET (molecular biology), a plasmid vector for protein expression; contains T7 promoter and a selective marker gene, e.g. lac I.
• Pólya enumeration theorem, a mathematical theorem in enumerative combinatorics.
• Potential evapotranspiration, a measure of the atmospheric demand for water vapour from evaporation and transpiration.

• something in technology:
• Commodore PET (Personal Electronic Transactor), a 1970's era personal computer.
• Personal Energy Transportation, mobility device for disabled individuals.
• Polyethylene terephthalate, a common plastic material in the polyester family.
• Privacy enhancing technologies, a general term for a set of computer tools, applications and mechanisms.

• something in education:
• Parent Effectiveness Training (P.E.T.), a parent education program developed by Thomas Gordon.
• Preliminary English Test, an international examination of English proficiency.
• Psychometric Entrance Test, an Israeli standardized university entrance exam.

• something in government:
• Politiets Efterretningstjeneste, the national intelligence security agency of Denmark.
• Potentially Exempt Transfer, a concept in the inheritance tax code of the United Kingdom.

• something in entertainment:
• "Personal Electronic Thing" in the Starship Titanic video game, part of the player-computer persona communications system.
• Personal Terminal (MegaMan), a handheld device used in the Megaman Battle Network video games.

• an organization:
• Pet, Inc., a American producer of evaporated milk and other food products, now part of General Mills.
• PET International, non-profit organization that promotes and supports Personal Energy Transportation.

• something else:
• Peru Time, abbreviation of the time zone for Peru.