Lakes & Ponds
You'll want to make sure that any bodies of water are safe for humans to swim in before you let your Pug take a dip. Possible hazards of allowing a Pug to swim in a pond or lake include:
Blue-green Algae (Cyanobacteria)
poisoning -
Even very small exposure to this (just a mouthful of water with this sort of algae) can be fatal to dogs. Sings are vomiting,
diarrhea, seizures, coma, shock, trouble breathing and even with treatment, it can be deadly.
Liptosprirosis -
This is a disease that is carried by the urine of wild animals. Most dogs are only vaccinated by this if deemed at risk; so a Pug will not be protected unless an owner asked for this inoculation specifically and the Pug is up-to-date on shots.