The system for reporting a poisoning appears to be different across the regions, so ask your local vet what the procedures are for your area. If your pet has been poisoned, get them to your vet immediately. They will pump their stomach. Should the animal die, they'll analyse the contents of the animal's stomach in order to give you details of the poison. In addition, they will file a formal report in order for the authorities to be alerted to the problem. Should your animal already be dead, then you must take the cadaver to your vet for in order for them to investigate the cause.
Further contacts:
The Forestale have an interest in this issue & will investigate if you've proof of poisoning.
Corpo forestale dello stato/ The State Forestry Corp. http://en.wikipedia.org/wiki/Corpo_Forestale_dello_Stato
Ring them on 1515 in the case of an emergency. I have always found them very helpful.
There is no harm in informing your local Carabinieri so they know what is happening. They may or may not come out to investigate.
You may wish to contact the animal protection charity ENPA http://www.enpa.it/it/
If you get no response from your local branch contact their Head Office in Rome.
A Crusade in Italy Against the Criminals Who Murder Our Pets
