We are away from our largest house for most of the year and have our landscaper watch it during both extended periods (summer and winter). He checks it inside and out and takes care of minor issues and repairs. We pay him what amounts to around $50 per visit. Worth it because he does an extensive checklist.
We don't want cameras, smart thermostats, etc., because part of the point is not fussing over it when we are not there. There is an alarm system that will deal with intrusion, hot temps, cold temps, water, smoke, carbon monoxide, you name it, but it runs itself.
At our smaller house, which is unoccupied nine + months per year, we have a caretaker who visits weekly and checks before and after storms. The house is drained and winterized, and the heat is left on at a low setting. He can deal with minor repairs.
At our condo, which is unoccupied for seven or so months a year, the manager and staff take complete care of it, inside and out.
We take our dog with us for all but short trips (up to two weeks), and kennel him during those. We would not travel without him for longer than that, not fair to him and part of being a dog owner.