Some dinosaurs were big,

 

Kuva; Zoonar/Michael Rosskothen/Zoonar GmbH/Alamy. 

Joel Kontinen

When we look at evolution, many different taxa  have evolved very large body sizes. researchers think that as a general rule, an animal grows in size based on an increase in growth rate. However. Many studies tend to question this outcome. .

 For example,  D’Emic et al have found that when n it comes to dinosaurs, they had an array of body sizes. They also found that  large body sizes have evolved very large body sizes an array of body sizes changes in the duration of growth played a large role.

So not all dinosaurs were big, Some were the size of sheep

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Vignieri , Sacha. 2023. . How to get big. Science 23 February.