Because of your pets health. If you have a 26lb dog receiving a pill for 26-50lb dogs, not only are you giving them double the necessary dose of neurotoxins and pesticides, but you are giving them an *entire months* worth up front. An entire months dose for a 50lb dog. These things *could* be given on a weekly basis at a dose intended for a 26lb dog.
Making the world better, one answer at a time. I am a sixty one year old woman who is in good health. I received a tetanus shot yesterday and hours later I was feeling a bit tired. Romany Sedhom.
Side Effects of Tetanus Shot in Adults. The good news is that tetanus is preventable with immunization. However, the tetanus shot comes with its fair share of side effects. You should expect some swelling and redness around the site of the injection and the indications for this range from mild to severe.