hell ya they do.. if im not paying attention, and leave it sitting out, its all but gone to them... hell i came home a few years back when i sold to find that my dog had, and i swear on my mothers life every word of this is true, opened the desk where i kept my stash.. which had a sliding door on it... pulled out the back pack that contained whatever amount i had.. pulled out the large ziplock bag with the weed (back pack was unzipped)... ripped through that bag.. opened another bag that actually had the weed in it.. and ate, oh i dunno, anywhere from 3/4 to 1 ounce... there was a SHIT load of weed on the ground too.. i imagine he had his fill after what he ate... poor little guy was FUCKED up... he was only about 8 or 9 months at the time too... now it seems i cant ever get high enough, but i couldnt imagine making 1 brownie with an ounce worth of weed in it and eating it... wow... it would be something else for sure...