Mountain dog, we're told? (4)

I believe the answer is:

peke

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'mountain dog' is the definition.
'peke' can be an answer for 'dog' (short for Pekingese). I'm not certain of the 'mountain' bit.

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for peke that I've seen before include "Little dog" , "Small canine" , "In short, it's a small short-legged dog" , "Small snub-nosed dog" , "5 [MANS BEST FRIEND]" .)

I've seen this clue in the Evening Standard.

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