The proof is in about vaccinatiions

When I first started going to the Holistic veterinary East York Animal Clinic four years ago the Veterinary told me that dogs did not need anything other than rabies. I was willing to try this in order to get Davina's seasonal allergies under control. I was skeptical at the time. I was also worried thinking maybe she will get Parvo or distemper or something.
Well since then, there have been many articles written about over vaccination and how it breaks down the dog's immune system. There have been articles in Dogs in Canada, and various veterinary websites about this.
Many dogs today have developed food allergies, as well as environmental allergies. This is mainly due to a breakdown of the immune system due to over vaccination.
It should be noted that after the puppy shots that the dog received within the first three to four months of life he only needs the rabies vaccination. Instead of vaccinating, ask your veterinary to do what are called titre tests. This is a blood test to find out if your dog has the antibodies for Parvo. If he does then he does not need the vaccination. Other vaccinations your dog does not really need are kennel cough, and Lepto vaccine. It should be noted that certain breeds of dogs cannot tolerate the Lepto vaccine well, and this should be researched as well as consulting with your veterinary about how well your dog can tolerate certain vaccinations. The new rabies vaccinations are good for three years.
In addition to this, some heart worm medications such as sentinel have insecticides to kill fleas and tics. This is harmful to your dog.
When choosing a heart worm medication check which ones do not have insecticides.
Heart Guard which is for heart worm only is a safe bet.
It is important that your dog be as natural a dog as possible.