A Springer Spaniel needed an operation after swallowing his 40th pair of underwear.
Taffy has also wolfed down 300 socks and destroyed 15 pairs of shoes belonging to his owners Eubie and Sharon Saayman and their son Liam, three.
He even once ate the keys to their Mercedes car.
Normally, everything he eats come out but, the last pair of undies would not budge.
South African-born vet Eubie, 34, operated on his pet after noticing he was in pain.
He said: "He didn't touch his food for two days and lay in his bed looking sorry for himself.
I knew straight away what had happened so I didn't need an X-ray to see the problem.
"His stomach was swollen and, during the operation, just as I thought, there was a pair of my son's Bob the Builder pants that had got stuck."
Taffy has fully recovered from the operation - but is already up to his old tricks again.