Fertility

Fertility is a value that female wolves have that determines how easy they become pregnant, specifically how many tries it might take to successfully breed them. The lower the fertility value, the harder the wolf is to breed. You can view your female wolf's fertility category on their page, but the exact percentage isn't visible until you reveal the wolf's fertility on the Fertility Snake page. This costs 20 Silver Cones per wolf. A wolf's fertility is determined when they are conceived and is fixed. Sex-changing a wolf multiple times will not alter their fertility.

According to the breeding tutorial quest, wolves with low fertilities may have a higher chance of birthing a random mutation (but not a genetic one)! Fertility does not affect how many pups a wolf tends to have in one litter, this is purely random. Each fertility falls into a specific category, which serves as a descriptive hint if you do not have the exact fertility percentage revealed.

Fertility Thresholds
Infertile	0%
Extremely Low	1%
Very Low	2 - 10%
Low	11 - 30%
Average	31 - 50%
Good	51 - 70%
Very Good	71 - 90%
High	91 - 99%
Extremely High	100%

You can temporarily increase or decrease your wolf's fertility using Juniper Berries or Pasque Flowers, purchased from the Fertility Snake. The fertility adjustment only applies until the wolf's next successful breeding.

Fertility Items
Juniper Berries	Decreases your wolf's fertility by 10% for their next breeding. Can be stacked until the wolf is at 1% fertility.
Pasque Flower	Increases your wolf's fertility by 10% for their next breeding. Can be stacked until the wolf is at 100% fertility.