The bee hummingbird (Mellisuga helenae) is "the smallest dinosaur that ever lived". Of course your question only applies to non-avian dinosaurs.
For over a century the smallest known dinosaur was the 3 foot Compsognathus, otfen compared to chickens in size. The discoveries in China for the last 20 years have revealed many smaller dinosaurs. Currently the smallest known dinosaur is Epidexipteyx, at only 1 foot long.
The smallest dinosaur that ever lived on earth was "westlothiana," it is almost the same size as a fully grown human's toe!
the smallest dinosaur ever discovered so far is the compsongnathus this animal lived in the Jurassic period and the largest dinosaur ever discovered is argentinosaurus it weight 100 tons!!!!
Most palaeontologists believe compsognathus was the smallest dinosaur, but recent discoveries of an a dinosaur, micropachycephalosaurus that may be the smallest dinosaur ever and has the longest name ever given to a dinosaur!The smallest dinosaur is said to be the compsognathus.Its just 2 feet long and weighs only up to 6.5 pounds. There are a few more small dinosaurs which have the same heeight of the compsognathus.They are the saltopus and the echinodon.
`it was comsgnothus
The smallest meat-eating dinosaur ever was Microraptor, at 2 feet long and lighter than a turkey.
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The earliest carnivorous dinosaur known is Eoraptor.
itiits the biggest dinosaur that ever lived
1500 years.
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The longest dinosaur is believed to be Argentinasaurus, which could grow to 110 feet.