Why doesn’t my dog catch my cold?

The long-running series in which readers answer other readers’ questions on subjects ranging from trivial flights of fancy to profound scientific concepts
  
  

A woman and her American cocker spaniel at Crufts ... why don’t canines catch colds?
A woman and her American cocker spaniel at Crufts ... why don’t canines catch colds? Photograph: Darren Staples/Reuters

I’ve got a streaming cold but my dog is unaffected. Why doesn’t she catch my cold and why can’t whatever it is that stops her getting a cold be used to treat my cold?

Peter Hanson, Exeter

• Post your answers – and new questions – below or email them to nq@theguardian.com

 

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