Did you talk about a classic "doggirl" , or a "wolfgirl" ?
- If it's classic one, you can try find one at "Talia monsters offers" that change all weeks if i remind well. If you can't have a female directly, you can try mate a "male dog" for obtain your female, don't hesitate save/reload when you're full energy.
- If you search to obtain the "wolfgirl" you need follow the quest, and help the surch, don't remember the name of nun, for some "spy party" then you will obtain 3-4 monsters at the end.