I see from the pictures you have some lovely little darlings in the neighborhood. After you mow, set up a fenced area and put a dog house in it. Stake a heavy chain, about 3/8 inch links to a stake outside. Use the chain to mark a boundary in an arc around the dog house. Now spray the ground with a soil sterilizer so it will kill all the grass. Now run the chain into the dog house like the dog just went in. When a little darling comes around looking to maybe pry the window open for a 5 finger discount, they'll see the chain and think twice. Every now and then move it around or run the chain to the building and leave it unhooked like the dog is inside. I've got a friend who had a LOT of trouble with theft but that stopped it really quick. Every now and then, he'd have his German Shepherd hooked up so a dog would be seen at times. The girl would like you to death but looked like she would rip your arm off for a snack.