Sadly, it is a dog's instinct to like yards. You could get a cat (though this may mean they become more interested). If the problem is other dogs getting into your yard, you could install high fences; if the problem is your own dog getting in the yard, simply make sure any door leading to the garden from a place your dog has access to is securely locked.
If the problem is a front yard, then high fences may not be recommended. Again, if the problem is other dogs, install a small fence and as an extra precaution put up a 'No Dogs' sign. Obviously dogs can't read, but owners can and this would discourage them. If the problem is your dog, keep them on a lead as you pass the yard.
This won't make it less appealing, but it will mean that the dogs will find it harder to get to your yard. If they find it very hard to get in, they might find it less appealing.
You can make your yard more accommodating for feral dogs by leaving food and water out. Keep the yard quiet and keep other pets and people out of the yard. You should use extreme caution around feral dogs. They are wild and are not used to humans. They may attack.
There are many things that take place on a job that may make it unappealing. For example, if a person must get dirty, that would be unappealing. If a person must stand all day or deal with certain unsavory people, that would be unappealing as well.
German Sheperds
Move
We use rubber snakes. Put them in yard. On cars. Or fences
can a mole in my yard hurt my small dog/
Fear is the taste of rotten, slimy, crunchy things. Think of things that are unappealing to you and make you anxious!
possible but no
3 feet make a yard.
It is usually stray. That's what many would call a junk yard dog...
You are probably liable to some extent, depending on your local laws, because your dogs have shown aggression toward other dogs and killed one. Imagine if a child had wandered into your back yard and been killed: you'd definitely be liable then, too. Your dogs are dangerous and you should take action to make sure they pose no threat to anyone or any other dog, whether in your yard or not.
The dogs' toys were scattered all over the yard.