Twist, maybe the dogs but I just cant see the yaks running away from home. It they stampeed you dont want anyone knowing they are yours anyway and WHO in their right mind is gonna say ohh I found a yak, Lets check him and see if he has a microchip .
you just never know in this day and age. The chips them selves are pretty cheap and so it the chipper gun, IT's the reader that is pricey.