Dogs suffering allergic reactions and death after being injected with popular Merck vaccine

‘Dog owners and veterinary associations in the United Kingdom have been warning of a rash of dangerous and even lethal side effects from a popular vaccine designed to protect dogs from a rare and mild illness.
The disease in question, leptospirosis, can be serious in both dogs and humans, but most cases are mild. It is spread via the urine of infected wild and domestic animals, typically mice and rats, and is most common in poor and rural regions of tropical countries or Eastern Europe. It is not common in the United Kingdom. For this reason, the vaccine is considered optional, rather than required or even recommended.’
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