"Ο σκύλος είχε παίξει πάρα πολύ."

Translation: The dog had played a lot.

[jeanprendiville]

" The dog had played too much" should I think be considered.

[mizinamo]

It's accepted now.

[cparticle]

"I think the dog had played very much" should also be accepted.

[Christa437682]

What about the dog had played a great deal??

[troll1995]

Added! Many thanks! :)

[NickMCLB]

"The dog had played so much." should also be accepted.

[mizinamo]

"The dog had played so much." should also be accepted.

Why do you think so?

τόσο πολύ "so much" and πάρα πολύ "very much / too much" seem different to me.