Oh well, this is great that you’re taking owning of a frenchie seriously and planning ahead. I guess what you’re talking about is the pet insurance. From what I can see in the internet, i can tell: it varies from $25 to $80 a month, depending on a previous vet exam and on what you want to be covered. The more bells and whistles included - higher the bill, that is only normal. So maybe make sure the illness and accidents are covered, and routine check-ups and vaccinations are something you can budget for…. there are no surprises there.
Here is also a link, that might be helpful: http://frenchiefriends.ning.com/forum/topics/health-insurance-companies?page=1&commentId=781059%3AComment%3A52648&x=1#781059Comment52648