For my sister. What can she use to keep dogs out of her trash?

My sister lives in a very very small farming town. I mean SMALL. The trsh cans the have are like this. One large outdoor can and then a large wire box for extra trash(poorly made at that). She has 3 dogs that keep on getting in the trash and I would love to know of what spary or deterant she can use to keep them... show more My sister lives in a very very small farming town. I mean SMALL. The trsh cans the have are like this. One large outdoor can and then a large wire box for extra trash(poorly made at that). She has 3 dogs that keep on getting in the trash and I would love to know of what spary or deterant she can use to keep them away. I'm sad to say she is getting so fed up with them she going to do something stupid, so please if anyone has any information on any products or solutions please let me know. These are owned animals allowed to run loose. Pleanty of loose animals cause of the lack of traffic.
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