"Someone out there has deliberately set this trap where domestic cats and possibly children could get caught in it. We must find who did this and prosecute them,'' she said.
In the earlier case, a cat was found caught in a trap in Silverstone Place, Henderson, and was later reunited with its owner after having a leg amputated.
Ms Kalin said the SPCA was investigating both cases, but it appeared the traps had been laid illegally. "On the face of it, we would certainly have issues and would want our inspectors to complete an investigation.''
Leg traps cannot be used without permission within 150 metres of a dwelling or anywhere there is a probable risk of catching a pet.
But she said the SPCA would not advocate their use in any setting, and would like to see the traps banned in the Auckland region. "Our position is they are inhumane, they inflict terrible pain, and we wouldn't advocate the use of them for any animal.''
The traps could easily catch a small child, causing severe injury, Ms Kalin said. ``A young child could get their foot caught in it and the child would come off second-best.''
Humane cat traps were readily available for hire, but also couldn't be used to trap another person's pet, she said.
A third pet cat had a front leg amputated after being caught in a gin trap in Greymouth last month.
Anybody with information about the gin traps, please contact the SPCA on 09 256-7300.