The Animals in That Country by Laura Jean McKay

Hard-drinking, foul-mouthed, and allergic to bullshit, Jean is not your usual grandma. She's never been good at getting on with other humans, apart from her beloved granddaughter, Kimberly. Instead, she surrounds herself with animals, working as a guide in an outback wildlife park. And although Jean talks to all her charges, she has a particular soft spot for a young dingo called Sue. As disturbing news arrives of a pandemic sweeping the country, Jean realises this is no ordinary flu: its chief symptom is that its victims begin to understand the language of animals - first mammals, then birds and insects, too. As the flu progresses, the unstoppable voices become overwhelming, and many people begin to lose their minds, including Jean's infected son, Lee. When he takes off with Kimberly, heading south, Jean feels the pull to follow her kin.