Yes you are allowed, RP with users, get to know them and become mates or some people go to mate centers in bonfire (i advice you not to get a mate from mate center though, they tend not to stay with you and cheat on you with another male/female when your offline)
you can also adopt pups, simply just ask people C:
NOTE: Mating its self (E.G getting on top of each other in public/ buttswinging over each other etc) however is not accepted becoming mates with someone is though anything of "actually mating" should be kept away from the public
~Rink