Why do cows bite and pull out other cows hair?
They don't. They lick themselves and each other. They don't pull out each other's hair.
Trichotillomania is an illness that produces a compulsive urge to pull out your own hair. The signs that someone is suffering from trichotillomania include differing hair length on their scalp and anxiety and depression. Usually they repeatedly pull out from: scalp, eyelashes, eyebrows. But people with this disorder can pull from other places. A strong urge to pull, and then feelings of relief after the hair is pulled. Patchy bald areas on the scalp or…
There are several reasons why this can happen. When rabbits are fighting they will often pull out the other rabbits hair. When nest building, the female will sometimes pull out the males hair to build her nest with. Sometimes it can be a part of over grooming where one rabbit becomes so intently focused on cleaning the other that they end up developing bald patches.
it may be old age or the mouse might be sick. as strange as it seems some mice in a desperate attempt to relive stress from other cage mates' other pets and even you may pull out their own hair! other cage mates will sometimes pull hair out of another mouse to show dominance in witch case they should be separated. this looks a lot like ringworm.
Trichotillomania is a type of psychological condition that involves strong urges to pull out one's own hair at the root from places like the scalp, eyebrows, eyelashes, or pubic area. Some people pull large handfuls of hair, which can leave bald patches on the scalp or eyebrows. Other people pull out their hair one strand at a time. Some inspect the strand after pulling it out or play with the hair after it's been pulled.
Not sure if you have actually seen your guinea pig pull out rabbit hair, or if you have just noticed rabbit hair around. Guinea pigs generally do not mix well with other animals. This is not because of the guinea pigs, but that other animals tend to attack them. You may be seeing the aftermath of some conflict? Most breeders recommend that you don't house guinea pigs with rabbits or rats.