The ability to be worn while swimming depends on the system you purchase. Some collars are waterproof, meaning they are made to withstand submersion in water. Others are only water resistant, which means they are only made to withstand the rain and snow, but not submersion in water.
Here is an example of one that comes with a waterproof collar that your dog should be able to wear while swimming: http://www.drsfostersmith.com/produ...
If you have any questions that you would like to ask us directly, as opposed to waiting for another customer to offer advice or their opinion, please feel free to contact our Customer Service Department at 1-800-381-7179. You can also email them at CustomerService@DrsFosterSmith.com.