A disease spread in dog poo could spell disaster for cattle near walking routes on the Belfast hills, conservationists have warned.
Neospora has been branded a "silent killer" but is easily avoided if dog walkers bag and bin their pets' faeces.
Infection causes miscarriages in pregnant cows and leaves them unable to breed again.
Dr Lizzy Pinkerton from the Belfast Hills Partnership said cattle were "basically the conservation tool" on the hills, where they help manage vegetation to support a healthy biodiversity.
"Not everyone is a responsible dog owner," she said.