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Hi there kindly answer following questions for further advice:
Age? Male or female?
Past medical history?
Any medicines using?
Smoking and alcohol?
So most likely you have pet allergy. Did you have any meeting or tests done by allergy specialist
If you need a letter you need a confirmation test done by allergy specialist otherwise we have do not have any evidence
Have you spoken to your GP about it?
Have you looked around for any private allergy specialist centre?
I think the fastest way would be try look for private allergy center or ask GP if they know any around your area