Any thing you put into a swimming pool will bring some things into the water. a dog is likely to leave some hair and dirt in a pool the same as a human would however you are unlikely to catch illnesses from the dog while you are more likely to catch human illnesses from humans. However if your pool is properly looked after there is Little to worry about either way.
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Almost impossible, and I've never heard of it happening. Dogs get very few diseases that can be transmitted to a human. Of those I can't think of one that would survive even seconds in chlorinated swimming pool water. I think you're safe on this one. Uh, what about the small unseen feces that may be attached to the dogs hair someplace on its body - - e-coli. Dogs carry more bacteria on their bodies than do humans. The excess dog hair collected in the filter would mean having to clean the filter more often which in turn uses more water, chemicals and labor to offset. If a cartridge type filter is installed on the circulation system that means that the filter will have to be dismantled and cleaned manually. If you have a pool service they will iniate extra charges for the extra work involved. One way or the other you end up paying more for the priviledge of letting your dog swim in the pool. E. colidoes not survive exposure to chlorinated water, nor does it transmit in a water medium. Bear in mind also that E. coliis endemic -- it's everywhere. The only time it causes trouble is when it gets into the body proper (say bad sterile technique during a chest operation), or if you eat meat contaminated with a huge population of it. Neither of these are even remotely possible in the harsh environment of a swimming pool. On this one, you're safe. As to your pool filter, which isn't really my area of expertise, some breeds shed -- and some don't. I can see you don't like the idea of dogs in pools -- and aesthetically, that's your call. But, with all due respect, you're incorrect about E. coli being a problem, and I'm going to guess that hair in the filter depends entirely on the breed. No offense intended.
There are not many sanitary concerns with dogs in a swimming pool. The adverse affects would be on your pool not on your health. The hair clogs the filters quickly. The dirt and shed hair depletes your Chlorine and raises your pH. In addition their nails often will rip vinyl and scratch plaster. Overall it isn't recommended. I suggest a lake, or river.
However, if it is only the sanitary concerns you are worried about, rest assured that dogs are cleaner in the pool than humans. Dogs do not pee or poop in the pools. Their saliva is more clean than that of a human, and dirt naturally finds its ways in to the pool anyway. Just be prepared to add lots and lots more chlorine.