Paralytic Shellfish Poisoning (PSP) (reference small PDF) can have symptoms that look very much like those seen in botulism and described above. Rapid on set descending paralysis could be a key indicator of either toxin.

In this case house rabbits living in Pennsylvanian are unlikely to encounter PSP, but it may be a consideration in other similar cases.

Paralytic Shellfish Poisoning (PSP) (reference small PDF) can have symptoms that look very much like those seen in botulism and described above. Rapid on set descending paralysis could be a key indicator of either toxin. When death occurs it is usually via respiratory failure

The lethal dose of PSP in rabbits is LD50 in μg/kg 181-200 symptom on set begins in 1 - 3 hours with recovery beginning in 12 (ref) to 24 (ref) hours. Complete recover is expected in a few days (references varied, but faster then botulism).

In this case house rabbits living in Pennsylvanian are unlikely to encounter PSP. Additionally symptom development above continued into what would be the recovery period for PSP. While probably not the cause here, it may be a consideration in other similar cases.