There is a Roxy gaiden and an Eris gaiden. There might be more but I haven't seen them. Also the three cannon wives are Sylphie, Eris, and Roxy. It is heavily implied that Rudy has numerous beast women lovers especially in his old age as he is seen as a man of consummate strength and is peerless in battle even in his 70s which is very attractive to beastgirls.