Harry does worry about Dobbin (4,5)

I believe the answer is:

dray horse

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'dobbin' is the definition.
The definition and answer can be both animals as well as being singular nouns.
Perhaps you can see a link between them that I can't see?

'harry does worry' is the wordplay.
'worry' indicates anagramming the letters.
'harry'+'does'='harrydoes'
'harrydoes' is an anagram of 'DRAY-HORSE'.

'about' is the link.

Can you help me to learn more?

(Another definition for dray horse that I've seen is " load-bearer".)

I've seen this clue in The Globe and Mail.

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