Cara de perro is literally dog face , but :
In Spain , " A cara de perro" , " A caraperro" o " A caracán" means that you don't share something with your friends , family , etc , for example :
"Me he comido la bolsa de patatas a caraperro" ( yo solo y sin darle a nadie )
" A tuerto " means the same , often used when talking about "hemp cigarettes not passed to your friends"
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