Scar's body is powerful, so it can handle the spikes (Goji Senter said the indom can't do much with more heavy on him or her, but scar can scar is not like otter indom scar in can hander the body weight even if the spikes are big scar is buker) And if others try to attack, he can spike whip on them with his tail and big buke legs to help with the weight on him. And neck snap him? Well, if you do good luck with a bloody mouth because spinks on his neck can slice those things. and with a red tooth, that's not like others, that one tooth can do a lot.
Also, claws from other dinosaurs can't do much against scar because scar's tooth can bite and rip off the claws. Even if you try, your claws can't do much. And with the messed-up tooth that one tooth can break bones.