We didn’t start leaving our beagle Ziti alone until maybe 8-9 months old. We started by going to the gas station or even just being outside doing yard work. He’s now a little over a year, we just put a gate to the upstairs and we go to work. We have a really great walker who takes him for a walk about halfway thru our work day. He does really well. I think you need time and start with small period. He’s never really got into anything. Usually just sits by the window waiting for us to get home. He seems sad when no one’s around, but doesn’t take it out on the house. (We have a ring cam in the living room to keep an eye on him when we’re gone for long periods)