Crossword Genius

Empty dogs repeatedly struggling with haunch — these, perhaps? (10)

Ross

I believe the answer is:

dachshunds

'empty dogs' is the definition.
'dachshunds' can be an answer for 'dogs' (dachshund is a kind of dog). I am unsure of the 'empty' bit.

I don't understand the rest of the clue.

I've seen this clue in The Times.
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