Speak to the victim:
Speak to the dog's owner - since there are two sides to every story, it is important that you speak to the dog's owner to see if they agree to the details provided by the victim, or if they dispute it.
Speak with other tenants in the building - hear their perspective so that you will obtain a better understanding of the situation.
Your action and your records - the appropriate next step to take will depend on the following factors:
In all cases
All the above should be in hard copy and distributed to the victim and the pet owner as soon as possible.
It is unfortunate that situations such as these occur, but as the landlord, it is your obligation to look out for the well-being of all of your tenants and the community in which they reside. When an animal bites, the animal has become a liability and a danger to those around it. You must take the necessary precautions, whether it be posting “Beware of Dog” signs, having the animal removed from the premises, having the tenant move-out, or evicting them.