Koreen Morrell, 29, had hoped to give Chip a home but was disappointed when she was told over the phone by an animal shelter worker he'd likely be put down, because he was part pitbull.
"It's disappointing, he looked like a cute beautiful puppy, I'm sure with the right upbringing he would have done well," she said. "I'm so gutted and heartbroken, his photos made me really want him.
"We are such an animal family, we have had millions of animals in our time. It's really cruel an innocent puppy that hasn't done anything wrong has to get put down."
Mr Robins was equally disappointed to hear about the developments and said he'd never have called the centre if he'd known what would happen.
"I'd have taken him home," he said, "I'd go and get him back if I could."
"Only after the dog is healthy will we assess whether the dog is suitable for adoption."
He said the dog's potential owner would also be given the opportunity to claim their pet, but if no-one came forward assessments would then be undertaken to assess the puppy's suitability to be adopted out.
"We do this to ensure the adoption will be safe and health for both potential owners and the animal."