Dog owners who found a razor blade concealed inside a tennis ball at a popular country park have issued a warning to other pet owners.
Police are now investigating the find, which the owner believes was specially made to target dogs.
The incident is believed to have happened in Lyme Park near Disley in Stockport on Friday evening.
A dog owner claims their puppies found the balls hidden in reeds at the far end of the park near the Knott car park at around 6pm.
They say their puppies began chewing at it however it then disintegrated and a brand new razor blade was found wedged inside.
They say "can't bear to think of the consequences" had the dogs chewed or swallowed the blade itself during incident which they have reported to police and park rangers.
Details of the incident were shared with the Stockport Crime Watch Facebook page by an unnamed dog owner.
The post said: "This ball containing a new razor blade inside was picked up by my dogs in the reeds adjacent to the Knott car park at the far end of Lyme Park at 6.00 pm 24th May.
"It has been doctored by someone who evidently has malevolent intentions towards dogs.
"My puppies carried it back to the car and chewed it up. We found this vicious razor blade inside.
"The pond life responsible may use poison or there may be more doctored balls in the vicinity.
"The police and the rangers at Lyme have been informed and have assigned an incident number IML410822.
"Please let them know of any further developments.
"Please be vigilant- my dogs just found this old ball set in the reeds hidden for them to find.
"I even threw it for them! I can’t bear to think of the consequences..."
A spokeswoman for the National Trust, who run Lyme Park said: “We are aware of an incident reported by a local dog walker on Friday 24 May. The matter is now being investigated by local police.
"We've informed our countryside team who will be carrying out additional checks whilst working in the wider estate.”