All the time. ET is one that is consistent she will growl and hiss at any and all.
The rest take turns chasing each other. One day Bailey will be the target of Lenny and Boots, the next day Boots is the target for Peak and Lenny, two hours later it could be Peak as the target for Princess and boots. Bart and Mits are never a target except for ET.
We never know who is going after whom. We have water swart bottles all over the house. If it sounds like it's getting too rough someone gets wet. ET seems to have a tendency to attract a water.