Hello everyone! I wanted to ask for advice about my dog, Orion. He is a one year old kokoni mix breed, and about 10 kg (aprx. 22 pounds). He is an overall amazing dog, but I have an issue with him being over-friendly. What I mean is, he would trust just anybody and follow them around and when somebody calls him he totally ignores me or he has a really hard time focusing on what I'm telling him. Today I was at my wits' end. There is no park near us, and the area I live in is quiet, so I took off his leash and let him run in a grassy area freely. I do this because 90% of the time he is near me and obeys every command I give him, plus he needs exercise, and I can't provide it for him in any other way. So we were heading home, and suddenly he saw a delivery man entering our building. He saw him as well, and yelled "Come! COME HERE, good boy" and such, and my guy just lost it. He barked like crazy and run towards him. I yelled him "come here" and "no" again and again, but he just totally ignored me (which he never does in any other circumstance!!) and jumped on the guy barking excessively. Orion was totally friendly, and did not mean any harm, yet he acted like he was possessed. I'm very worried about this kind of behaviour, because like in many cities where I live, some people hate dogs and feed them poisoned food. Yesterday, a post came up online in a nearby city, showing little fish hooks (22 in total) that had been placed inside of three sausages. A beagle swallowed one of them, and the other two were eaten by strays, one of which died. Also, what happens if someone calls him across the street? I do not have the money necessary for hiring a professional trainer... so, does anyone have an advice on that matter? Please do not tell me to have him on a leash at all times, cause that does not change the root of the problem. Also, I do not want him to be aggressive, just to calm downa bit. Thank you for your time... I apologize for the HUGE post!