O wauw, yes that is very stressful... And I'm so sorry you had to go through that, I hope al your chickens are fine now?
I was concerned last week when the neighbours' rooster had escaped, but he found no way into our garden, I have made the fence so that even cats have trouble coming in, so that if they come in every bird knows right away... And my chickens only free range when I' m in the garden, otherwise the're in their run, we have foxes, raccoons, dogs and birds of prey... The rooster spent the night in a low tree in the playground next to our garden, the next day when he started crowing we spotted him, the neighbour opened his fence close to the playground put his hens there and the rooster walk right back to them...
Yesterday my Lisa spotted the rooster and his hens, came a little closer and than ran of like the wind... Hid in a bush behind me and went on with her daily life ..
Health wise, I thought about that when the avian flu stuff came up, and I think that with all the wild birds and other wildlife here you can count all the chickens in our village (60 people) as one flock... There' s no way you can stop anything contagious here... But all chickens here have to be vaccinated for a lot, (mareks, vnd, ib, and so on) so they all have the same standart health position...
We were lucky when we moved 4 years ago that we found this village, the people are friendly and take good care of their animals, they help eachother out, but also leave you in peace...