The Boston Public Health Commission (BPHC) has closed Jamaica Pond due to a suspected bloom of blue-green algae, which can be very harmful and even cause death to dogs. During the closing, swimming, boating, fishing, or engaging in other recreational activities on or in the water are not allowed. Dogs are also not allowed to swim in or drink the water. Health officials noted the algae bloom, also known as cyanobacteria, through a visual inspection of the pond. Algae blooms such as this may produce toxins that can make people and pets sick.