As I mentioned in other questions in Pets.SE, I have a cat since 2011 who, sadly, can only live outside my dad's house.
Since mid-August I had to move out to another quite small apartment, which is too little for both me and him. So I had to be separated from him because of my studies.
A strongly close acquaintance of mine reassured me by saying that my cat will know when I'll be back. I plan to come back to my dad's at least one in two weekend for the beginning and I was afraid when I'll come back that he wouldn't be here. Sometimes, but especially when I leave my dad's house for a long period, he only comes in the night to eat his diner we gave him. My acquaintance told me that my cat will smell my odor in the garden if I'll come and thus, he'll recognize it and he'll know I came. Is that true? Are cats' sense of smell that efficient?