I wouldn’t keep one anywhere else, my own Kelpie crosses need stimulation and they have an overwhelming desire to be at my side. I couldn’t see me having a holiday they would probably commit suicide after day one. They properly need to be out doing something as much as possible and at every single possible opportunity. If they were in the house I’m pretty sure it would be destroyed the first time I left them alone for an hour ? obviously Kelpies and ACD’s are not exactly the same but I imagine the work ethic side of things to be similar.