One my last flight from Lima to Bogota around a month a half ago, I saw a Belgian Malinois at the Viva Air check-in counter. At first I thought it was sniffing for drugs but eventually I found out that there were bringing this massive dog onto the plane. It whined a little bit as the plane was taxiing for takeover but it calmed down after that. There was a smaller dog on the plane as well but I was surprised to see such a big dog (with no fake emotional support tag) being brought onboard the plane. I guess the rules are different in South America.