Simple indicator of a healthy dog they say (2,5)
I believe the answer is:
no sweat
'simple' is the definition.
(I've seen this in another clue)
I don't understand how the rest of the clue works.
(Other definitions for no sweat that I've seen before include "in Australia with ease" , "That's not a problem!" , "It's not a problem (result of using antiperspirant?)" , "There shouldn't be any objection" , "OK" .)