translated from Spanish: Your dog can identify people who want to harm you

Dogs are smarter than we thought, as they can even identify people who intend to harm them and their owners, all thanks to the interpretation of emotions and body language, according to UNAM studies.
“Science has proven that they are able to interpret emotions, even identify people who have bad intentions against them or their owners, just by attitude, tone of voice and body language,” UNAM, Alberto Tejeda Perea, of the Hospital Veterinary Specialty in Wildlife and Clinical Ethology, Faculty of Veterinary Medicine and Zootechnics (FMVZ) of the Maximum House of Studies.
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The researcher noted that dogs are sociable and cooperative with those who demonstrate these same behaviors.
“Once a connection is established they will know that it is their favorite human. Canines are good at distinguishing nonverbal language, so they decide whether or not to establish a relationship with someone equally cooperative,” explained the zootechnist veterinary doctor.
Tejeda Perea noted that dogs are empathetic to their social group, plus they can also select only the companions who they find nice to play.
“They show childlike behavioreven, and apparently the emotional side to evaluate the other to make it their friend or not,” academic said.
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He added that the olfactory and visual memory of dogs is excellent so they will always remember who was generous with them, even if it takes a lot of time, but also who mistreated them.
The researcher added that like humans, dogs also exhibit anxiety which can result in aggressive behavior.
If a dog suffers anxiety, he will be irritated and “can be highly aggressive, scary or sleepwalking,” he added.
This anxiety can be reflected in skin diseases and manifests itself when they spend a lot of time alone or if they have been trained on daily punishments; 
Tejeda Perea and her research group discuss skin problems in canines.
The specialist said that at UNAM they work with dogs and their owners to “restart the relationship” and focus it into a positive emotional state. 
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Original source in Spanish