We've decided that medical questions are on topic, and especially when the pet already has a diagnosis, the questions can be very focused about how to manage that particular diagnosis.
However, I'm not sure that "Here's a list of symptoms, do you have any advice for me/my pet?" questions should necessarily be on topic. We cannot examine the animal, and most of us are not animal care professionals. The best we can do is say "Go to the vet".
I compiled a list of example questions to show how widespread the problem is:
- Dog suffers from diarrhea, lack of appetite cyclically
- Leg injury confusing the vet
- 13 year old dog not eating, blind with diabetes, vets can find nothing else wrong medically
- Abscess in horses hoof
- My rabbit is hyperventilating and can't get comfortable. What is wrong with her?
- Cloudy blue-ish eye with redness inside eye of a puppy
- What's wrong with this kitten's eyes and how do I take care of them?
- My cat ate a (part of a) balloon. What should I do?
- My Cat is missing hair on her neck
- Dog with leukocytosis neutrophilia, treatments?
- What could be the reason for my Schnauzer having a bluish eye?
- Dog keeps biting at this spot on his tail
I noted as well that these questions tend to not have very good or highly upvoted answers. There's just not much that we can do (short of really weird random intuitive leaps like in Should I be worried that my cat is making a huffing noise? ).
I tried to create something of a canonical answer in "Leg Injury Confusing the Vet", but that had a particular focus (how do I determine what tests to do at the vet), and many questions don't have that much focus and instead are just a list of vague symptoms. In addition, it would be WEIRD to close a question like "My dog has diarrhea" stating that it's a duplicate to a question about a leg injury.