Cacho perro.
What is the meaning or the translation of cacho perro?
6 Answers
In Chile, it's slang for "I understand [that]" (cacho) "my friend" (perro). "I understand what you mean, my friend"
This is what I found, not without difficulty. I should avoid the word!
Variante intensiva e insultante de perro: Persona de mala intención o carácter traicionero o muy egoista. Es adjetivo y sustantivo
We use the word "cachorro" here in Guatemala for "puppy."
Well cachorros de perro are puppies.
But I have a feeling that this is slang. Cacho can mean piece or I think is equivalent to cuerno / horn and is used in some expressions to talk about someone who is being cheated on (poner los cachos etc). Sorry I can't give you an unequivocal answer, I'll be interested to see if a native speaker can tell us all 
Btw do you have any context?
I'm going to take a possible misunderstanding spin here. 
It could be a slang-based insult gacho perro. I translate a nice version of it as, "rude dog".
As someone else had mentioned, context would really be helpful to see what is intended and what makes sense.
Nunca había oído que la palabra cachorro fuera abreviada de esa forma, la verdad para mí no tienen ningún sentido. You better wait for someone from Spain or, even better, Andalucía to answer that since I'm not aware of the usages of that word over there and just like Kiwi said, the average person from where I am would grasp that you're talking about someone who's being cheated on and not about dogs, which is not the case in your context
