When still nursing, most people describe a puppy’s breath as sweet. This is a recognizable smell in most breastfed puppies and it is mainly caused by the chemicals in their mother’s milk. Once weaned, their breath will start to take on the smell of the food they are eating. This is especially true if we sniff their mouths when they have recently eaten. When they have not eaten in a while, their breath should have no strong smell; much like ours when we have healthy mouths.