Top dog playing with bones son buried (4,2,4)

'top dog' is the definition.
(best in show at a dog show)

'playing with bones son buried' is the wordplay.
'playing' indicates anagramming the letters.
'son' becomes 's' (genealogical abbreviation for son).
'buried' means one lot of letters goes inside another.
'with'+'bones'='withbones'
'withbones' is an anagram of 'bestinhow'.
'bestinhow' going around 's' is 'BEST IN SHOW'.