(NBC NEWS) - Your refillable water bottle may be dirtier than your dog's bone!
A team from the website Treadmillreviews.net swabbed the lids of 12 water bottles used by athletes.
Each bottle contained about 1,000 times more bacteria than an average dog toy!
Water bottles with a straw-top were the cleanest and slide tops were the germiest.
Experts say you probably won't get sick from your water bottle. However, it's important to wash it regularly.
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