Aven said:
Birth defects can be attained randomly through breeding. Pups whose parents have a birth defect have a higher chance of getting the defect.

CP Penalty-

Deaf- 50 CP penalty in Perception

Hip Dysplasia - 100 CP penalty in battle, 150 CP penalty in agility

Anosmia -120 CP penalty in Perception. 50 CP penalty in Stealth.

Runt- 100 CP penalty in battle

Hydrocephalus -100 CP penalty in Empathy, 150 CP penalty in Wisdom, 50 CP penalty in Agility, 100 CP penalty in Spirituality.

Blind- 120 CP penalty in Perception, 120 CP penalty in battle

Dwarfism- 50 CP penalty in battle. 50 CP penalty in Agility

Hyposmia- 100CP penalty in Perception

Cerebellar Hypoplasia -150 CP penalty in Dominance. 100 CP penalty in Stealth. 150 CP penalty in Battle. 150 CP penalty in Agility.

Club Foot -50 CP penalty in Agility. 20 CP penalty in battle.

Spina Bifida- 150 CP penalty in Agility. 150 CP penalty in Battle.

Brachycephalic - 150 CP plenty in battle, 50 plenty in Stealth.

Picture Difference-

Albino- Changes the picture to a plain white wolf with a pink nose and pink eyes

Melanism- Changes the picture to a pitch black wolf.

Vitiligo- As the wolf ages, spots will show on their pelts. There are 4 versions of vitiligo markings.

Erythrism- Changes the picture to a brownish-copper wolf with black paws.

Leucism - Changes the picture to a pale coloured wolf.

Chimera - There are 8 varieties of chimera. It gives the wolf a split colour difference across its body.

No Known Effect-

Heart Murmur

Extra Vertebrae

Entropion

Crooked Tail

Extra Kidneys

Bald

Cleft Palate

Extra Toes

Original credits to Silver Souls for this guide

***NOTE: This are NOT equivalent to boosts! Boosts have their own guide, found here:

https://wolfplaygame.com/forums.php?f=29&t=102

Christmas Lightning said:

and survive one

Terbus said:

The part for Chimera needs an update, there's at least 9 variations of it not 8.