Dogs requiring painless treatment (8)

I believe the answer is:

spaniels

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

'painless treatment' is the wordplay.
'treatment' is an anagram indicator (the letters must be processed or treated).
'painless' anagrammed gives 'SPANIELS'.

'requiring' acts as a link.

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

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