Fish makes dog feel anxious (7)
I believe the answer is:
pomfret
'fish' is the definition.
(pomfret is a kind of fish)
'dog feel anxious' is the wordplay.
'dog' becomes 'pom' (short for Pomeranian).
'feel anxious' becomes 'fret' (I can't justify this - if you can you should give a lot more credence to this answer).
'pom'+'fret'='POMFRET'
'makes' is the link.
Can you help me to learn more?
(Other definitions for pomfret that I've seen before include "sort of cake" , "cake, Yorkshire style" , "Round flat liquorice sweet - Asian food fish" .)