I'm going to echo Lucy a bit:
1. As diagnoses go - food allergy is way down the list compared to other causes of allergy skin disease (food maybe 10-20% only) - and it can be any of the common protein sources that Australian dogs are exposed to: beef, chicken, poultry etc..... only way to properly diagnose these is a properly set up and under veterinary supervision.  You really need to work with a vet who knows what they are doing on this one and be prepared for rigorous diet monitoring (and also to dispel common myths).
2. Skin scrapings are needed for mite diagnosis - deep scrapes of feet - for demodex. Sarcoptes is diagnosed often on basis of distribution of lesions and other markers; eg history of being in contact with foxes or wombats infected with sarcoptic mange mite (not demodex!). Diagnostic-Treatment trials for sarcoptic mange may be part of initial work up.  You need to see a vet for this.
3. Fleas - always on the radar - must have proper prevention strategies in place (depends on vet and district - Advantage/Revolution are very effective in my experience).  Supermarket brands of flea control are worse than useless.
4. Allergies to anything and everything at this time of year - you need to work with your vet (or vet specialist). Don't just 'grab' a diagnosis off a forum such as this and run with that - work with a vet who knows how to diagnose and treat skin diseases...
5. Allergies to bacterial toxins or direct effective of bacteria... again - see a vet.
 No 'one answer' fits all. 
Again Lucy said "Bottom line with an itchy dog for any owner, you have a choice. You can proceed with treatment without out a diagnosis, just to make the dog more comfortable. Or you can try getting a diagnosis. But be warned, you won't always find out what is causing the itch, and sometimes, even when you do, you end up just using drugs to keep it comfortable anyway. When you DO find a cause, and CAN fix it, it is pretty rewarding - just doesn't happen often."
My only caveat - don't jump on the 'food allergy;' bandwagon without working with your vet.  People make it out as simple (and common) - it's not!
				
			
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