The following reference ranges for blood pressure indicate the varability between breed, particularly in dogs. Common trends are for giant breeds of dog to have a slightly lower than average blood pressure, and for racing breeds such as greyhounds to have a slightly higher than average blood pressure.
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There are normal ranges of blood pressure for animals as there are for humans. However, the range of 'normal' varies according to the breed where dogs are concerned. For example, giant breeds of dog tend to have a slightly lower than average blood pressure, and racing breeds, such as greyhounds, tend to have a slightly higher than average blood pressure. This must be taken into account when taking measurements.