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Characteristics
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Comfort is the key characteristic for dog bed filler. It must be durable so it does not flatten over time and become uncomfortable for the dog or the dog won't use the bed. The filler must also have some firmness to stand up to continual use. The filler should be breathable, and it should meet the needs of the dog. For example, a dog might have an allergy to a certain filler or the dog may have a physical condition requiring a particular filler.
Memory Foam
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Memory foam is used as a dog bed filler. Memory foam was originally developed by NASA for use in its aircraft seats to lesson impact on landing. It is an open cell polyurethane-silicon plastic that even after being compressed to 10 percent of its original size will return to its original shape. Memory foam is an appropriate bed filler for dogs with medical problems such as hip dysplasia because it will mold to the dog's shape, providing passive support to minimize pain in the hip joints. The foam will bounce back so when the dog lies down again in a different position, the foam will mold to its shape again. Alternatives providing the same benefits include medical-grade orthopedic foam and buckwheat hulls.
Cedar Chips
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Cedar is a natural flea repellent, so cedar chips are an appropriate choice of filler in areas of high flea activity. Cedar also has a pleasant aroma, offsetting the dog's smell. Some beds use a combination of cedar chips and polyfil for enhanced comfort.
Other Fillers
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Other dog bed fillers include polyester fiberfill, synthetic down-like filler and even filler made from post-consumer recycled plastic bottles.
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Good Filler for a Dog Bed
Dogs feel more secure if they have their own bed in a quiet, warm place. Absent a bed, dogs tend to gravitate toward couches, chairs and human beds, creating more cleaning work for their owners. Dog beds are made with a variety of different fillers. Choosing the appropriate filler for a particular dog bed involves considering the needs of both the dog and the owner.