Drew,
If it was a large body of water i wouldn't mind, but as i say i have the exact same problem if people swim in smaller lakes that they KNOW people are going to taking water from, it's just absolute selfishness at work IMO.
Problem with treating the water is most commonly used filters will not filter out viruses, so unless you are chemically treating or boiling the dog/human swimmers are directly putting other peoples health at risk.
Randy,
I'm sorry you feel that way, you do what you think is best in your admittedly tough situation, i can understand and sympathise, it still doesn't change the fact that i have an opinion on it though.
If compared like to like a dog that isn't forced to carry 10% of it's body weight is going to fitter for longer and less likely to be affected by mechanical injury.
I refuse to answer your comment on fish defecating in water as i believe you are just being factitious at this stage, your choice, but it's also my choice to ignore such comments.
Jennifer,
Whipworms
Hookworms
Roundworms
Tapeworms
Parvo
Corona
Giardiasis
Salmonellosis
Cryptosporidiosis
Campylobacteriosis
Are just some i found on a quick search, some i knew, others not.
I'm pretty sure i read a report a while ago where there was said to be a link between dogs bringing diseases into national parks that are causing deaths in the wolf population, if i remember correctly this example was put down to Parvo.
It's also a 2 way street, you dog is also open to catching many of those from drinking/swimming in contaminated water.
It might not even be that your dog is carrying them, they could well have stood in some poop or a rotting animal just before their swim.
As i say in larger bodies of water it's unlikely to be a problem, but if i witnessed someone allowing their dog to swim in a small body of water they is known to be a drinking source there would be absolute hell to pay.
Please let me be clear, i love dogs, i hike with my dog 2 to 3 times a week, i camp with my dog, i swim with my dog, she pretty much comes everywhere with me BUT we as responsible owners sometimes have to think about the impact we are having on both the health of the dog and anyone using the trails after us.
Even if it was 1 in a billion chance someone would get ill as a direct result from letting our dogs swim, it's hardly a great example to set is it.
Even as a dog owner i'd take offence to seeing a dog swim in a small body of water, i can only imagine the outrage for the anti-dog crew, it's really just giving them ammunition to get dogs kicked off even more areas.