I understand those who just say let the insurance deal with it, after all faffing about with locks and chains is a faff right? Even if the bike is loaded up with chains and stuff they can just cut through the frame and then steal it. OK, they can't sell it as a bike but they have wheels, fork, shock, motor battery, bars, tyres, brakes, gears and so forth.
But I just hate the idea of some low life scumbag stealing my bike and making money from my hard earned efforts out of a few minutes work. If they are having my bike, they are going to have to work for it, even if they have to carry it out in bits! And then there are the weeks and weeks of waiting before I can get a new bike. Correction months and months these days!
So I have put effort into making it a bit more difficult. My bike is kept in the garage. The windows are bolted shut and the pedestrian door has two 5-lever mortice locks, with different keys. The door is solid wood (ie not chipboard, not laminate, no glass, no plywood panels....ie solid wood 40mm thick). The door is secured with three heavy duty 4" stainless steel hinges The two up and over locked doors are bolted shut. The bike is secured to the floor with a Kryptonite New York Noose chain into a Kryptonite ground anchor secured with Kryptonite key lock, all three gold secure. In addition a Kryptonite wire cable locks the fork to the frame and the bike stand. OK, the latter is relatively easy to defeat, more of slow you down measure. I had one anyway so why not use it?
This pic shows the set up, before I started looping the cable through the fork. The towel is to protect the shock stanchion. My insurer was happy with the measures taken. And I don't leave the charger in the garage.
By the way if you are relying on a big dog, you need to get a little one to wake it up. A late friend of mine (RIP) had his house burgled by two men when him and his entire family were asleep. Neither of his extra large Akita dogs were woken by their entry. Akitas are Japanese fighting dogs and they come in three sizes, big, very big and "new trousers please!" His were of the latter. (Dog fighting must have weight divisions). It was only when the shouting started that they woke up. Then they were useful.