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Does having four legs aid dogs with climbing?

Our readers point to the work of John Maynard Smith, who said that vertical velocity should be inversely proportional to linear dimension - it’s not the number of legs that matters here

24 April 2024

2G4X8CE Female runner running with dogs in canicross style on hill

Westend61 GmbH/Alamy

Unlike me, my dogs bound up hills as easily as they run on the flat. Does having four legs aid with climbing, or are the dogs just fitter than me?

Andrew Carothers
Edinburgh, UK

The biologist and evolutionary theorist John Maynard Smith originally qualified and practised as an engineer, giving him unique insights into physical constraints on living organisms. His book, , devotes a section to examining how size affects the ability of animals to move uphill.

By considering the scaling effects of rate of metabolic heat loss, rate of oxygen supply and stresses on bones and…

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