First of all, it’s important to know your pet’s normals, and non-normals. Every pet is different.
If any other veterinarian has seen your pet, it’s important to gather all documents from those visits, so medical notes stay consistent! This makes your veterinarian’s job a lot easier, since they will what has/has not worked for your pet, improving better service for you and medical treatment for your pet.
Having the answer to these questions enables your veterinarian to have a clearer picture of your pet’s situation:
When did he/she begin to show that something is wrong?
How quickly did the symptoms progress/gotten worse?
Any changes in your pet’s routine around the onset of signs?
Has his/her diet, living situation, or energy level changed?
Has this issue occurred before? Any past medical problems? - how were they treated, and how effective was the treatment?
Mostly indoor or outdoor?
Exposed to what kind of water?
Flea and tick prevention (yes/no, what kind/brand, and how often)
Where specifically does your pet sleep?
Common behaviors signaling your pet is probably uncomfortable:
More than frequent licking of any parts of the body
More than frequent head shaking/pawing/scratching
More than frequent rubbing on furniture
Remember that an elizabethan collar enables buffer time get your pet examined by a veterinarian without him/her doing as much self-damage or any at all.