Service/Emotional thearpy Dog for my son

Our son is in need of a service/Therapy dog he is in the Autistic Umbrella with a few other anxieties and special needs. The Landlord of the property that we have now is not allowing to have a pet for our son,we even have a letter from the Doctor stating it is very much needed. There is a neighbor that has an emotional therapy dog and the realtor is not doing or even saying anything about it to the person. that is how we ended up here, Yes we are military but good lord come on. Now that we have the letter we can not get the appropriate help and legal assistance that we need. Just by signing this petition it will help us greatly and all help is truly appreciated.