@Limblesswolf

1) Cactus Bucks

Mutated antlers that form out-of-place lumps not suitable for antler fights. These lumps may cover deer eyes and ears, and can cause pain. Usually caused by injuries to the back legs (causes hormone inbalance) or damage to the antler base (pedicles). Can be shed (with difficulty) but may return next year if aforementioned injuries persist.

2) Drop Tines

Another antler mutation caused by injuries to back legs or antler pedicles, or just old age if it's in their genetics. Rather common for a mutation. Generally harmless besides getting stuck on trees, won't usually cause problems with antler locking. Can be shed off and be gone next year, or may return.

3) Uniantler

Different than a buck in the middle of shedding antlers who has lost one, these bucks have only grown one. Caused by nutrition, genetics, or damage to back legs or pedicles. Weight difference may caused balancing issues, may be difficult to fight with, and does may find unappealing. May be shed and regrow a pair the next year, may be permanent.

4) Multiantler/Multibeam

Buck with two "main beams" on one antler where tines grow from. Like most antler mutations, caused by nutrition, genetics, or damage to back legs or pedicles. Usually shed and not repeated but it may be recurring.

5) Cowhorn buck/Tineless buck

Different from Spike Bucks (which are a natural stage of yearlings having small antlers with no tines yet) these are older bucks that should have tines at this age. Caused by nutrition, genetics, or damage to back legs or pedicles. Difficult to fight with, cannot antler lock, may be dangerous to the opponent and the owner of the antlers himself. Usually shed and done with but very rarely may keep recurring for life.

6) Leucistic

Far more common than Albino but often mistaken for them, these deer are mostly white and are missing a good amount of melanin that would give their body it's natural coloration. They blend poorly into the environment and may sunburn easily. They may also have sensitive eyes and weakened eyesight.

7) Albino

True albino deer are far more rare than leucistic. These deer have no melanin in their skin and pelt whatsoever. They hide poorly and their skin burns quickly in the sun. They also have eyes very sensitive to light, and vision difficulties.

8) Antlered Doe

These intersex deer have high testosterone for does. They may have a variety of sex chromosome conditions that cause this, or simply plenty of testosterone to go around. They may be infertile, fertile in theory but not affected by heat hormones in rut season, or be fully fertile. They may never shed their antlers, never shed their antler velvet, or shed both normally, depending on testosterone levels. They may challenge and be challenged in antler battles, or avoid battles.

9) Antlerless Buck

These sometimes-intersex deer have low testosterone levels for a buck. This may be due to sex chromosome conditions, damage to the testicles, or just naturally low testosterone. They will never grow antlers, and will rarely if ever mate as a result. They may be infertile, be fertile but not be affected strongly by rut hormones, or be fully fertile.

10) Polydactyly

11) Piebaldism

Certain spots on the pelt are missing their melanin, and appear white. Piebaldism is a type of leucism, and it is caused by genetics. Piebald deer may be spotted easily by predators and may have skin and eye sensitivity to sunlight.

12) Permanent Velvet

Bucks with velvet that does not shed in Autumn due to low testosterone or poor nutrition. They will not be able to fight with them, at least not without injuring the velvet and causing blood loss, risking infection and attracting predators. Additionally, the thin skin that makes of velvet does little to shield the blood vessels within from the cold in Winter, making a high chance of the buck freezing to death as his blood cools rapidly. Assuming he survives a winter, the antlers will likely not shed in Spring and he may be affected for life.

13) Overgrown Pelt

Deer that grow far too heavy fur, less of an issue in Winter but may cause overheating and death in hot Summers. On tip of this, it may block vision, snag on branches, or be a tripping hazard. May be caused by genetics, could shed with the natural seasonal shedding of coats and be gone, or may grow again with each new coat.

14) Overgrown Hooves/Floundering

Caused by an unbalanced diet of too many fermentable carbs, these deer grow hooves that are too durable, and do not take the natural wear that hooves usually take to keep them a healthy length. These deer may not be able to run, or even walk at all. This can be fixed with a proper diet.

15) Melanism

Caused by genetics, this condition causes a deer to have too much melanin in their fur, making them far darker than their peers. Melanistic deer may be spotted easier by predators, or may overheat in hot Summers.

16) Extreme Atypical Antlers

Any shape of antlers that goes against the usual known shape for the species can be considered atypical, but some go to extremes. Caused by nutrition, genetics, or damage to back legs or pedicles. Can be heavy, burdensome, get caught on foliage, get in the deer's face and eyes, or even hurt him. Depending on the exact set, he may be able to battle with them. Can be shed but may return if causing factors persist.

17) Extra Ears

Caused by genetics, these deer do not generally have better hearing; in fact, it may be worse. The extra set of thin body tissue is as vulnerable to frostbite as the first pair as well. Ultimately, this rare condition is rather harmless otherwise.

18) Bulwinkle Deer

These deer may have a snout resembling a moose's. This is caused by a bacteria disease, and is permanent. It will cause issues with eating and grooming, and may eventually be fatal, though a deer may live years with it.

19) Asymmetrical Antlers

A rather common mutation, these bucks will likely have a normal set the next year, but this year will encounter balancing and fighting issues. Caused by nutrition, genetics, or damage to back legs or pedicles.

20) Antler Pearling