There is also a "dumb" form of the disease in which the animal is lethargic, weak in one or more limbs, and unable to raise its head or make sounds because its throat and neck muscles are paralyzed. In both kinds of animal rabies, death occurs a few days after symptoms appear, usually from respiratory failure.
Rabies - Symptoms, Treatment and Prevention
Paralytic phase
The third and final phase of infection usually lasts for 2 to 4 days. Initial symptoms include the following:
Appearance of choking
Dropping of the lower jaw (in dogs)
Inability to swallow, leading to drooling and foaming of saliva (i.e., "foaming at the mouth")
Paralysis of jaw, throat, and chewing muscles
Rabies - Symptoms - animalhealthchannel
sounds like the late stage of rabies to me.