To some degree, recognizing illness in an animal is a function of knowing what normal is - normal behavior, normal eating/drinking patterns, normal elimination patterns, etc. However, to understand what symptoms are common to certain types of illness, you would need to be trained as a veterinarian - this is much of what the curriculum covers.
Depends which psychiatric illness...
That would completely depend on the particular terminal illness. The symptoms could be anything, including great pain or nausea/vomiting, to completely asymptomatic.
Homosexuality isn't an illness that has symptoms. So, there are no symptoms of homosexuality.
You examine the symptoms.
Aspergillosis is an illness caused by mold. The symptoms can vary depending on the type of illness. Common symptoms are fever, wheezing, asthma, chest or join pain and coughing.
Some symptoms of foodborne illness include, but are not limited to:CrampsNauseaVomitingDiarrheaHeadacheFeverThe symptoms will often vary with the individual and the causative agent.
Botulism
Vomiting, upset stomach.
Vomiting, upset stomach.
No, it has symptoms. If no symptoms and a positive test, it is likely a false positive.
A blood type is not a condition or illness. Therefore, a blood type does not and can not have "symptoms".
Infected animals often have no symptoms.