Got some experience with DIY alarm systems here. Look into something like the SimpliSafe system. Relatively affordable, easy to set up, and it’s got all the bells and whistles. I've found the peace of mind it offers to be invaluable.
As for guard dogs, they certainly have their place, but remember, they're not just a tool, they're a responsibility. Dogs need care, attention, and training, which can be an investment in itself. But yeah, a well-trained dog is a fantastic deterrent and offer great companionship to boot.
On another note, don't forget the basics. Reinforce your doors and windows. Install deadbolt locks and use window security film. It's not as high tech as an alarm system or as compelling as a dog, but it can make a massive difference.
Curious though, anyone tried the Ring security system? How does it compare to SimpliSafe?