The six-year-old Mastiff is "153 pounds of pure love" and has been at the shelter since January 22.
His former family was forced to surrender him due to housing instability.
Due to his arthritis, he should be in a home with a limited amount of stairs.
Anyone interested in meeting Dexter can stop by the Adoption Center on Tuesday at 1:00 pm or call 617-226-5602.
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