Why does Tiger only have good or strong allies horse & dog? Why not a superb match for these signs?

It is strange that the two signs mention as compatible choices are not superb match. The pig is not mention in the charts that I have found and it shows up as a superb match here. O_o Why is that? My boyfriend's birthday is 22/1/1971 (dog) and mines is 2/6/1962 (tiger), I already feel strange being older than he is and now this. Will we be only allies? I do not want marriage, I've been married and don't want that again, but I do want a loving relationship with a partner who sees me that way I see him. Benefits usually come to an end whereas love stretches onward and is mostly neverending.