I noticed that her respiration’s is fasting than it usual;also she is scratching her neck side and she is unable to sleep
You should take Chloe to the vet for a general examination and an auscultation. Itching and scratching appears often due some dermatological problem. Therefore, it is essential to perform a comprehensive diagnostic protocol, starting with simple and low-cost diagnostic tests that will allow to rule out the most common causes. Later on, it may be necessary to resort to more complex and specific tests to rule out allergies, autoimmune diseases, hormonal pathologies, etc.
Probably with an antibiotic treatment for a few days your dog will get better, but your veterinarian should examine your dog and decide the treatment.
All the best,