I'm reaching out in the hope that somebody might have a clue on this one? This week end I have had to have 2 of my girls spayed due to Pyo. The first girl was on Friday. She was 3 1/2 years old and had one litter 6 months ago. The second was on Saturday and she is 5 1/2 years old and had one litter 2 years ago. She had been mated on the 11th December and 13th December. Of further note was that her sibling was also spayed for pyo in a very similar situation. She was bred at around 3 1/2 years of age (first breeding) and which also resulted in an emergency pyo spay, again approx 25 days post tie. These are all young dogs and the only exacting criteria is the male? The vet is at a loss to explain it as indeed am I. Anybody have any thoughts on this one please. Both girls are doing well and I'm grateful for that (both cases of open pyo). This just seems at odds with usual cases of pyo as in older dogs., and especially as the youngest one had a litter of puppies 6 months ago? Thanks.