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So last week my wife and I discovered some evidence of mice fooling around in our kitchen at night (e.g. shuffled cleaning supplies under the sink, hoarded dog food, and of course their droppings). After a little research, I decided to get the classic spring-style mouse traps. I set them with some peanut butter and after a night or two, I woke up to a dead mouse. After that, I cleaned up and set traps again. Things were quiet for a few days but then we got another hit. A second dead mouse captured. We were happy up until this point because we figured it was just one mouse but since we got the second one, I had to ask myself "when do I stop setting traps?" and "did the mouse come in because it smelled the peanut butter set trap?". It's sort of a catch 22 now. I am afraid that the mouse got in "because" I had peanut butter out (as part of the set trap). I'm afraid that if I keep setting traps that I may just be inviting these little guys in. Suggestions?

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if they are hoarding dog food, clearly peanut butter isn't their only source of food. I'd set traps until you go a few days without catching anything, then stop, but ask the dog to tell you if anyone is mooching his food :-) –  Jason Jun 27 '12 at 22:43
    
@Jason - Thanks for the comment. I should have mentioned that I stopped leaving food out over night for the dog so that shouldn't be a source any longer. –  Brian Jun 27 '12 at 22:45
    
There is never just one mouse. ;) –  DA01 Jun 28 '12 at 5:16
    
At least it sounds like your traps are in an accessible area. I had mice in my attic for the longest time. I'd set the traps out for a few days and catch 2-3 mice. Fast forward a couple weeks later, and there would be scurrying sounds coming from the attic again. Eventually I ended up forgetting I had put the traps in the attic. Three weeks later, I found the maggot-filled corpse of a very unlucky mouse in a trap I had forgotten to check. –  Doresoom Jun 28 '12 at 21:36
    
I've heard from a pest control expert that they start in your attic, travel down through the basement then meet u in the middle in the living space...& that's when u know u have an infestation! –  user7541 Sep 24 '12 at 22:40
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up vote 10 down vote accepted

Setting traps will kill what you have, but you still have the problem of the mice getting in. you need to figure out how they are getting into the house. Mice can get through incredibly tiny holes, so it might be a chore to find them all. But as you find holes, seal them up. Steel wool is useful for this as they don't like chewing through it.

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I personally go with 'forever'. I've got a good-size house, on a little bit land, and a garage door that I leave open for fair amounts of time each day in good weather. I'm ALWAYS going to have mice getting in, even though I've patched every hole I can find. It's just sort of inevitable at this point. So I keep the snap-traps under the sink and in the basement. I check them every couple of weeks, change the bait (I like cheese) now and then, and I get a few mice every year.

But no major infestations, and they don't seem to get past my initial trap points, so I don't get them in the pantry or anything.

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