An animal activist spotted the blue dogs wandering the streets of Mumbai near an industrial zone where factories had been accused of pouring untreated chemicals directly into the Kasadi River.
Arati Chauhan said dogs and birds had been left a bright blue after swimming in the contaminated river.
"We managed to take one dog for treatment as it was suffering with eye infection," Arati Chauhan, head of the Navi Mumbai Animal Protection Cell, told AFP.
Chauhan wrote to the Maharashtra Pollution Control Board, a state body, to complain, and posted images of the dyed dogs online.
The board intervened, shutting down the factory for breaching laws on waste disposal, after pictures of the egg-shell blue dogs went viral online.
"We have shut down the erring firm after it was found they were flouting norms and endangering animals in the vicinity," Jayant Hajare, the board's sub-regional officer told AFP.
Officials were also monitoring the health of the canines, Hajare added.
The Kasadi runs through Taloja, Mumbai's dense industrial zone home to nearly 1000 factories, data from the Mumbai-based Watchdog Foundation shows.
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