Most of the infectious diseases are spread through the respiratory tract.
A kennel cough and canine influenza are passed during coughing or sneezing.
If your dog has a healthy immune system there is a very slim chance to contract a serious disease from sharing water bowl.
Dogs have very few sweat glands, so they cool themselves primarily by panting and evaporation off the foot pads. If it's hot and moist the dog won't be able to cool itself as well. You can help the dog by providing a water bottle with ice and pouring it into a portable bowl.
Another way to help your dog is to carry a small spray bottle with some ice and spray their paw pads from time to time when walking.
If you have a puppy do not take it to the dog park until it is 6 to 9 month old and been well vaccinated.
The dog park can be overwhelming for a puppy when you have all of the dogs coming up to the puppy.
Professional Pet Sitting Services offered in the Upper to Mid-Pinellas County Area