https://www.vetsurgeon.org/f/clinical-questions/5690/about-labradors-dermatites Hi, Clinical case.Labrador 2 years old,not spayed.First clinical signs;(2010.07.10.)otitis externa,itching,redness of the ear base.Skin scraping negative(demodex,sarcoptes),ringworms test negatives,alergic test negatives.Treatment protocol; Surolanen-USTelligent Community 10https://www.vetsurgeon.org/thread/22203?ContentTypeID=1Sat, 07 Aug 2010 19:22:48 GMT146601cc-3922-4be7-9974-7e1d4e45a66b:6e0701d0-6ac4-4a90-ad3a-f14dc6959adcMark Holmes<p>Yes quite right, obviously did not read that right.</p><div style="clear:both;"></div>https://www.vetsurgeon.org/thread/22202?ContentTypeID=1Sat, 07 Aug 2010 19:19:50 GMT146601cc-3922-4be7-9974-7e1d4e45a66b:17b35ec0-8e80-4f71-9997-e154d99afbf2Rob Loxley<p>[quote user=&quot;Mark Holmes&quot;]You don&#39;t mention food trials[/quote]</p> <p>I assume he&#39;s using Hills d/d as a novel diet</p> <p>[quote user=&quot;Aurelijus Laurinavicius&quot;]alergic test negatives[/quote]</p> <p>Remember diagnosis of atopy happens before doing intradermal/serology tests. Many normal dogs will give positive results on these tests, and some atopic dogs show up all negative - i.e. diagnosis of atopy with undeterminable allergens.</p> <p>As a suggestion, on the basis of what you say (not all of which I quite follow), maybe a biopsy would shed some light on things?</p><div style="clear:both;"></div>https://www.vetsurgeon.org/thread/22193?ContentTypeID=1Sat, 07 Aug 2010 16:03:24 GMT146601cc-3922-4be7-9974-7e1d4e45a66b:43209445-8476-4f65-9a51-7dffcbd63bceMark Holmes<p>Adverse food reaction? You don&#39;t mention food trials. If relying on blood testing for allergic work up they can be misleading and about food in particular. I might be considering 6 - 8 weeks of hills as or purina ha diet</p><div style="clear:both;"></div>