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[snowy]

Munchkin used to wag her tail up and down really quickly, now though, she wags her tail side to side, wiggling her bum. How can i communicate to pleo that i prefer her wagging her tail up and down, is there any way to say to your pleo that you love what they're doing?

[InmemoryofRomeo]

Two options:

Try rewarding Pleo with attention or the leaf when she behaves the way you want.

or...

Shadow the side wagging motion with an up and down wagging motion. (A little complicated but entirely possible)

[Bumblebee]

Well, You can try just lightly holding Munchkin's tail in one place when it start's too wag, and when she does the one you like you can reward her with lots of attention

[Dadio]

Snowy; 

The shadow option put forth by IMR is the way to go. 

Bumblebee's may work but may end up in a broken tail. 

Dadio