Can a landlord in Massachusetts refuse to rent an apartment to a person because they own a service dog?

I am searching for an apartment in the Boston, MA area. I own a 5 pound chihuahua that is designated a service dog. Can a landlord tell me that they do not accept dogs in their units, even though I am disabled and my dog is a service animal?
Update: Mark, the law you posted is only valid for federaly assisted housing. I am refering to private landlords (individual owners and big corp's)
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