Pupternity: What Determines Litter Size in Dogs?

litter sizeNormal puppy litter size tends to vary from one to twelve. The world record according to Guinness is a whopping twenty four puppies, birthed by a Neapolitan Mastiff in the UK in 2004. Why does litter size vary so much and what determines litter size in puppies? OVRS looks at the main factors affecting litter size.

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