All livestock should be vaccinated against tetanus, but I think it is horrible that this is out on the market for someone who is not a licensed veterinarian to give. There are so many things that can go wrong with any vaccine, but especially bacterial vaccines! No one should be giving vaccines unless they are trained to do so. and thinking that you know what you are doing is completely different than actually knowing what you are doing.

Pros: does the job

Cons: you can cause a lot of damage if you don't know what you are doing!