0 | Normal activity |
1 | Rigid posture or immobility |
2 | Stiffened, extended, and often arched (Straub) tail |
3 | Partial body clonus, including forelimb or hindlimb clonus (seen rarely) or head bobbing |
3.5 | Whole-body continuous clonic seizures while retaining posture |
4 | Rearing |
4.5 | Severe whole body continuous clonic seizures while retaining posture |
5 | Rearing, falling |
6 | Tonic–clonic seizures, loss of posture, jumping |