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My mental image until I looked it up was around the size of a dog. No, I don't know why

The older ones were smaller.

https://earthlymission.com/size-comparison-generations-mars-...

But even Spirit and Oppy were… well, I guess they're roughly the size of a very large dog. At 185 kg, much heavier than even the largest dogs though.

Because it's called rover? :)

https://archive.is/tpcRK for the article

Stupid me thought its go kart sized like the one Howard Wolowitz in The Big Bang Theory brought to a baseball stadium.