I had ...have...err..... okay I have one pitbull lab mix left, Named Kiddi who is 7 years old, and will not play, unless it is me or the BF doing pretend moves toward her, and that usually just sends her darting back and forth across the house, or doing body plops at our feet so we can rub her. She has NEVER shown an interest in toys... just cookies and bones...other treats.

Shina, on the other hand, my 17 year old pit lab who just passed recently, LOVED to play. She would keep herself entertained even if nobody was there to play with her! I know many times I woke up in the morning to hear her in the other room, or even in her bed next to me, on her back, and just playing with her beloved squeaky toys... I would normally just lay there and giggle, and if I were within eyesight of her...she would stop, toy in mouth, look at her mommy, and wag her tail... I could go on and on .....

So, Yep! I think its personality...definately! I have two of the exact same breed of dog, and two totally different girls!