This is by far the best animal in the game but at the same time you never and I mean never attack or try to attack another wild giga. The wild gigas no matter what level have thousands of more health and almost 3 times the amount of damage as a tamed giga. And even with multiple level 200+ gigas you would not even want to attack one level 10 giga as that the faster the wild giga goes into Rage Mode the faster and more likely you and your whole team of gigas are to die.
While my brother and I are trying to tame a giga, a purlovia jumped me and my pt named TOOTHLESS, I was surrounded by dire wolves at the time and the giga was next to me. I got killed by a wolf and my brother got on my pt to save it but both toothless and my brother got killed by the giga.