There is a movement in the US to ban pit bulls, because of all the recent attacks on humans.
Trying to think out the value of insurance on a pit bull...
If your pit bull injures someone, that person's health insurance pays for their care. You might have to pay a few hundred for pain and suffering, right? So, would it be reasonable to buy insurance to cover the possibility of having to pay that money? Seems like a lot of unnecessary paperwork. And if the dog is a repeat offender, you're gonna have to put him down. Should you get an insurance policy that has a provision for that? Under what conditions would they have to pay out? Not if YOU decide to have him put down. Only if an official says it is necessary (like a court order).
I don't see why this sort of insurance should be prohibited, provided the insurer and insured come to an agreement and sign a contract. But I really don't see it as being worth the expense of negotiating the contract.