Crossword Genius

Dog-star? Dwarf planet, anyway (5)

Ross

I believe the answer is:

pluto

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'dog' is the definition.
(I have seen 'animated dog' mean 'pluto' so perhaps 'dog' could also mean 'pluto')

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for pluto that I've seen before include "Planet discovered in 1930" , "It used to be a planet" , "Roman god" , "Distant planet" , "Minor planet" .)

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