Animals get agitated and suffer immensely. The one thing rabies does that is spectacular is that it make it really hard to swallow anything while greatly increasing saliva production.

That is because the virus propagated with saliva and stooping the host from swallowing helps keep a higher concentration of the virus in the mouth.

Animals go crazy aggressive, with good reasons:

"A new study published in the journal Scientific Reports shows how a small piece of the rabies virus can bind to and inhibit certain receptors in the brain that play a crucial role in regulating the behavior of mammals. This interferes with communication in the brain and induces frenzied behaviors that favor the transmission of the virus."

https://www.sciencedaily.com/releases/2017/10/171011091847.htm