What age does my dog need to be in order to use Miracle Vet? Matthew Kinneman November 12, 2018 19:26 Updated Follow Miracle Vet is safe for all breeds of dogs ages 4 weeks and older. It's also safe for cats ages 4 weeks and older. Related articles Is Miracle Vet safe? How much weight will my dog gain when using Miracle Vet? How do I use Miracle Vet? What are the ingredients in Miracle Vet? How much Miracle Vet should I feed my dog? Comments 0 comments Please sign in to leave a comment.