
Quoting
aardvarc
The classification was made by the dispatcher who took the call. If there's some sort of disturbance between people who live together or have a child together, even if it's not physical, it's a "domestic". It's not about WHAT is happening, it's about WHO it involved in the incident.
Given that "domestics" have a high rate of danger to parties concerned, exegent circumstances may have existed that allow police to enter without knocking or seeking a warrant. Keeping in mind the reasonableness of that action isn't based on what was ACTUALLY happening, but rather what the officer, given what they knew at the time, could reasonably suspect. If the dispatcher is telling the officer that there's yelling, screaming, sounds of a struggle, or lots of other things, police have a duty to act to quickly intervene and separate parties.