Dog breed heartily liking a dog’s breakfast, eating fish off skillet? (4,7,7)

I believe the answer is:
king charles spaniel
'dog' is the definition.
(King Charles spaniel is an example)
'breed heartily liking a dog's breakfast eating fish off skillet?' is the wordplay.
I cannot really see how this works, but
'breed' could be 'spaniel' (I have seen 'Breed of dog' mean 'spaniel' so perhaps 'breed' could also mean 'spaniel') and 'spaniel' is found in the answer.
'a' is within the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for king charles spaniel that I've seen before include "Cavalier dog?" , "Breed of dog named after British ruler" .)
