If a chain is too tight, the goat can become uncomfortable and this can cause rashes, infection, cuts. If the chain is too heavy for your goat, the goat can get a sore neck and often cuts and scratches from the chain. A goat should not be on a chain for an extended period of time, maybe when you cannot keep an eye on the goat if attention towards the animal is needed at all times or at night when animals can go astray.
hyperexcitability of the nerves that stimulate the muscles
It is unknown which animal has the shortest neck. Even animals with the longest neck like a giraffes may have members with some mutation that cause a short neck, as well as other species.
They are called wattles and have absolutely no purpose other than to adorn the neck. Any breed can have them, any sex can have them- not all goats have them, they "seem" to be genetic. Sometimes a goat will have only one, sometimes they will not be on the neck but under the ears like earrings or offset. They do no harm to have them other than when little babies are first born they may suck on each others wattles and they could get raw this way. They do have feeling and a blood supply and it is not a good thing to "cut them off" as some people have suggested.
This could be a type of mange. You should bring the cat to the vet because mange is not only lethal but certain types are extremely contagious.
Injection site reaction, abcess, cancerous or noncancerous growth
This sounds like 'star-gazing' which can be due to thiamine defieciency also known as polioencephalomalacia.
One possible cause is cigarettes. Seriously, I suggest researching the WebMD website. "Melanoma", a form of skincancer, is evidenced by black-colored sores on the skin.
You're not likely to pass cold sores from your face to your neck. Cold sores like to transfer from a wet place like the mouth to another wet place like the genitals or eyes. The rash on your neck could be a sweat rash or a bacterial infection.
Mudfever is caused by bacteria and results in irritation and dermatitis of the horse's legs, and sometimes belly and neck. It generally causes sores and scabs, and if severe enough can cause the horse to be lame.
You may have bed bugs.
In the muscular triangle area of the neck.
It may be suffering from polioencephalomalacia, as in a thiamine deficiency. The neck craning back is also called star gazing.
Are your cats spayed and neutered? If not this is the reason, he is trying to get her to stay still so he can mount her
You shouldn't use a choke chain. They cause damage to a dog's neck and trachea. A leash/collar combination called a "gentle leader" is a better choice.
It means that you yank someone's chain off their neck and steal it
(La) parure
I'm not a medical professional, but my guess is that, if it's in the right place, the sore can irritate your trigeminal nerve. Since it's responsible for facial sensation, a severe enough amount of pain (especially in the cheek or jaw) can "refer" pain to your ear, chin, or neck.