Arduino + Adafruit FONA 808 Shield + IMU

Hi,

I am looking to build a device which includes a GPS/GSM + IMU modules plus a microcontroller.

The objective of the project is to track the movements of my dog.

I have identified the GPS/GSM shield, Adafruit FONA 808 shield. I am not too sure on the IMU. I'm looking to get the accelerometer data to understand what the behaviour is.

And finally, I am thinking of using an arduino uno as a microcontroller.

Along with a battery pack.

Can someone recommend an IMU?

Regards,