Giardia in Dogs Heartworm in DogsFlea Prevention in Dogs
Above are links to Dr. Foster and Smiths pet education website. The best advice and treatments for your companion dog will be from your own veterinarian.
My vet recommends a Preventic Collar for my dogs while hiking with my dogs. It last for up to 3 months. This brand can only pick up at your vets office or possibly order online. It will prevent ticks. Advantage can be used in combination with the collar. Always look over your dog after a hike or a long stay outdoors.
I can't stress enough to be sure your pets are treated against Heartworms. The disease is transmitted through mosquito bites. If your pet is not on a preventive and left untreated, your best friend will die a horrible death. Personally I've fostered many Humane Society rescue dogs through Heartworm treatment. It is expensive and the after care is very difficult for the dog.
Giardia and Coccidia are also concerns when hiking with dogs. Giardia can be contracted from drinking from lakes, rivers, creeks and puddles. My dog picked it up last year when I allowed him several times to swim in a man made lake. It took several tests to accurately diagnose and walked out of the vet with $400 less. My other lab never picked it up and he swam just as often. Coccidia is picked up from your pet eating feces. These are 2 diseases to be aware of while hiking with your dog.