When caught, forcibly ejects dog (5)

I believe the answer is:

spitz

'dog' is the definition.
(spitz is a kind of dog)

I can't explain the remainder of the clue.

(Other definitions for spitz that I've seen before include "eg Samoyed" , "Little dog" , "Mark --, US swimmer" , "Pomeranian dog" .)

I've seen this clue in The Guardian.

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