The Health and Safety Executive and Environmental Health are among the bodies alerted to claims that a dog died as a result of its injuries.
States vet David Chamberlain has contacted all veterinary practices to investigate concerns over burns being suffered by pets.
The Vale Commons Council and the two nearby golf clubs say they have not used any harmful or non- approved chemicals or sprays at the common, leading to speculation that any offending liquid may have been dumped there illegally.
Dog owner Martyn Queripel said one of his dogs, a Newfoundland called Ebby, had suffered skin damage, after heading into a muddy area, near the Millennium Stone, about a fortnight ago.
He immediately took both his dogs to the sea to wash off the muddy water, but Ebby had a double coat of hair and it did not wash away completely.
Mr Queripel said a few days later he and his wife noticed she was scratching badly and irritated.
