What a day... My house got broken into...

So today I come home from work and saw my dog outside on the porch. which was weird because we leave our dog inside the kennel. Someone must have broke into the house because pur dog could not have gotten outside by himself. When I went inside I looked around to see if anything was miss and nothing was missing. Weird right? And the only people who have a keys are my dad and brother. I know my brother couldn't have gotten into the house because he works in the next town over and don't get off till late. So I asked my dad if he came by and he said no. And I do believe him because if he came by there would be no way that my dad would leave my dog outside. So idk who broken into my house. I didn't call the police because I leave in a small town and the police here will say " there is nothing they can do". There has been a lot of break in's in this town and it's usually drug addicts or teenagers. This is just confusing I'm trying to figure out how they got in all our doors were locked...