Wood shavings from pine and cedar trees have been used for years as bedding for everything from horses to mice. The shavings are a great bedding material because they are soft and comfortable, and they absorb excess moisture while covering up unpleasant odors. Wood shavings have a repellent effect on fleas and other insects, and they are environmentally safe when it is time to dispose of them. Another attractive feature of wood shavings is the pleasant aroma of pine and cedar. Wood shavings, however, also have potential health risks. Be sure the wood shavings come from a reputable source, and NEVER USE WOOD SHAVINGS FOR PREGNANT OR NEWBORN ANIMALS. Shavings can cause serious problems when used as bedding for a breeding bitch or newborn puppies. Wood shavings are sometimes found to carry a potentially harmful bacteria called Klebsiella. It is thought that this organism enters the trees or cut logs before they are processed. The problem arises when contaminated shavings get wet when used by bitches during whelping. The bacteria sometimes gain entry into the mother's mammary glands through the nipple, or into the uterus via the vagina. The puppies are infected by way of the umbilicus (belly button). This leads to a metritis or mastitis in the mother and a possible septicemia (blood infection) of the puppies. It is not difficult to treat the bitch with antibiotics, but the pups often die before anyone realizes this problem has occurred.
If you have a pregnant dog, or litter, or think bedding is needed for your outdoor dog, old blankets or pads which can be washed are a great alternative. Some dogs use them for toys or drag them out of the dog house, but if it is comfort they want, they will learn.