Crime scene protection is also critical. You need to respond, assess the situation, and react accordingly. Once things calm down and you know what's going on, you need to lock down the scene. That means keeping everyone out until the K-9 unit is done. That's right, you heard me. No, you can't interview and get your witness statements inside; no, you can't start processing the scene; and no, you can't touch anything that could be considered a scent article. Look at it this way: You can't be a little pregnant. You either take calling out K-9 seriously or you don't.
If you do call them out, then you can wait on some of these other tasks until the K-9 unit is done. The goal is to catch the bad guy, not for you to finish your paperwork expeditiously. We really need to change our mindset regarding K-9 units. If you call them out you need to treat every scene as a major incident. If you wouldn't contaminate a homicide scene that is basically over, why would you contaminate a crime scene that is still in progress?
The Radio
There is no bigger pet peeve of mine, outside of officer safety issues, than misuse of the radio. It's a supervisor's eternal fight. If K-9 is on a track, then everyone but K-9 should be quiet, unless someone spots the suspect. It never fails; when an alert tone goes out, some insidious chromosome kicks in and everyone involved gets diarrhea of the mouth. Acknowledge and go. Set up your perimeter and when the K-9 unit gets there and starts its track, the radio is theirs. If you are lucky to have Aviation respond, then radio traffic belongs to the K-9 unit and the air asset.
Do all of your admin-type talking on another channel. Keep the radio clear for updates on possible suspect location. I wish I had a dollar for every time I have had to admonish someone for some totality non-essential radio communication on the primary channel while K-9 was on a track. Some of the biggest violators are command staff. Wouldn't it be nice if we could get away with telling one such radio traffic abuser, "No, sir. I don't have an update for you because if I did, I would have told you already. If you'd listen to the radio, then you'd know what I know."