Just say this chant to the dog and it will help protect him from harm:
Diana, Goddess of the Wild,
Keeper of dogs both fierce and mild,
Hold (name of pet) safely in Your arms
And protect this creature from all harm.
And should the day come that he/she roams
Guide him/her to the path back home.
Bless (name of pet) with a joyful life
Free of hardship, stress, and strife.