Pug

I am new to the breed &  am getting mixed views on breeding,some say colours should never be mixed ie. black to fawn, others say it doesn't matter, I am actually wanting to buy a black bitch hopefully to show, so need to know what the fors & againsts are colour in any pedigrees, is it better to go for one that black through & through or does mixed colour in the pedigree have its advantages ?

I am keen to learn as much as I can & would be interested in hearing others views with if possible any actual factual back up for your preferences on breeding colours.I look forward to everyones thoughts.

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Technically there should not be a problem but I do see some dirty wrong colour pugs now adays especially in the fawns. I do not know why but feell suspicious that the black gene has something to do with with.

Sorry if I am not that helpful