Stab Darren in a struggle over the dog (5,7)

I believe the answer is:

saint bernard

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'the dog' is the definition.
(I know that Saint Bernard is a type of Canis lupus familiaris)

'stab darren in a struggle' is the wordplay.
'a struggle' indicates anagramming the letters (letters move around or struggle).
'stab'+'darren'+'in'='stabdarrenin'
'stabdarrenin' is an anagram of 'SAINT BERNARD'.

'over' acts as a link.
This may not be correct. It may belong to another bit of the clue.

Can you help me to learn more?

(Other definitions for saint bernard that I've seen before include "Large breed of dog" , "Alpine breed of dog" .)

I've seen this clue in The Irish Independent.

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