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A district council spokesman confirmed cyanobacteria has been found in algae in Rolleston's Foster Dog Park's pond but not in the water.
"The advice the council has received is that a dog would need to eat algae from the algal mat at the bottom of the pond to be at risk of getting sick," the spokesman said.
The test results come after a dog died at the Canterbury Canine Obedience and Selwyn Dog clubs ribbon trials that were held at the park last Sunday.
"Although the risk to dogs is low, the pond will remain fenced while planned work is done to decrease the possibility of algae growth in the pond."
The work is due to be completed next week from Tuesday to Friday.
The work on the pond will brush away the algae from the rocks in the pond and narrow the pond to increase the rate of water flowing through, the spokesperson said,
"The council has carried out monitoring and cleaning of the pond, but we’re reviewing our action plan to see how we can make things even safer including possibly adding signs to warn dog owners of the potential risk."