That depends on the type of dog, the history of it and the way the dog is treated throughout its life.
A dalmation has not been used as an aggressive dog throughout their history AFAIK, and is as safe as dogs get around nippers. The same can't be said for Rottweilers, Dobermans, etc.
Of course there is always a chance, and I wouldn't leave a defenceless baby in the presence of a dog that was unmuzzled or could reach it, but you can't say there's the same chance of a properly trained dalmation as there is a badly trained/treated rotty...
How do you mean?