Tenants Dog bites am I liable???

[Roger G.]

I have a two unit house one house in the front of property and second on back of property all fence together. The tenant in the front owns a dog The tenant in the back open the gate to get in the property after work and was bitten by the dog. Now the tenant is asking for my insurance to cover for damages My question is am I liable she is claiming that she missed two days of work. Or is the tenant owner of dog liable??