"He was crouched down being quiet; he had obviously dragged the trap and got it caught in some silage netting," she said.
"One of our inspectors almost tripped over him, and he went into a full panic mode and was trying to get away."
Lamb added: you could tell by how swollen the part of the paw inside the trap was that it had obviously been like that for a little while, poor guy."
The use of leg-hold traps are restricted under the Animal Welfare Act and cannot be used if there is a risk of catching a pet.
The SPCA advises people who use leg-hold traps to be aware of where they are setting them and the possibility of catching a domestic animal.
Morry was adopted by a Wellington-based foster mother, Sonia Christensen.
The full shortlist will be released this month before the SPCA's 2020 Annual Appeal.