Painless barking for dogs (8)

I believe the answer is:

spaniels

'for dogs' is the definition.
(spaniel is a kind of dog)

'painless barking' is the wordplay.
'barking' indicates anagramming the letters (UK slang for mad).
'painless' anagrammed gives 'SPANIELS'.

(Another definition for spaniels that I've seen is " The dogs can be oddly painless".)

I've seen this clue in The Guardian.

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