I am sorry you had this experience. I have been present with my pet birds when they had to be euthanized. It involved injections. One to sedate and another to put them to sleep.
I would question the vet to learn just how they euthanized your chicken that would make it dangerous. The situation...
My young Serama Rooster was beat up by his two girls while they sat their eggs. He had areas on his comb that were open holes. I treated the injuries with antibiotic ointment and the holes are closed. The flesh is not colored yet. Don’t know if this is an indication of a problem or normal...
My three week old Serama chick has had balance problems since hatch. Got somewhat better but not progressing. Eats and drinks but is weaker and not growing proportionately. Siblings are fine.
Initially fed MannaPro medicated starter and now Purina medicated starter ground up. Fresh water several...