OMG, that poor baby :(. And poor you, bc I know your heart is breaking seeing him like this.

My Wylie had ongoing skin issues...went on and on. His vet at the time was pretty much useless. Finally, feeling desperate, I decided to take him to Vet Dermatologist -- and that was just a miracle. Vet Derms can deal w/ complicated skin issues as experts, whereas generalist vets really can't...it's just not their expertise. When skin issues are ongoing, that's a good time to seek out a Vet Derm. Do you have these where you are?

I'm not sure what you mean by "parasite injection" - what do you mean? Also, was a skin scraping done and a culture done (culture would take about 10 days to grow)? What were the results? Did the bacteria scraping/slide show 'staph intermedius' or 'pyoderma'...does that ring a bell?

Also, when skin issues are ongoing - thyroid should be considered/checked. Also at this point, I'd want a skin biopsy done; sometimes, mites will burrow into the skin - and so the dog will test negative for mites - however, when a biopsy is done, the mites will be seen.

This is the Vet Derm I see - and the link I'm posting goes over some case studies and has pictures...maybe read some of these to see if something reminds you of what your kiddo is going through: Frequently Asked Questions | Dermatology for Animals

Please keep us posted, and keep posting about this - bc you never know when a member will come up with a piece of the puzzle for you, I've seen that happen so many times. :)

I believe there is only one vet dermatology clinic here and that is the next step.
Alfie was not itchy when he stared losing his hair and as my husband had just cut a few matts out (I wasn't at home when he did this) I just thought he w a very bad barber. As Alfie was still so young and at 14 weeks growing all the time so when the bald patch looked bigger we thought it was just because he was growing so much, he still wasn't showing any signs of bad itching or any rash at all.
We were attending the vet regularly anyway for his flea and worm treatment so asked about it on the next visit and got an additional topical mite treatment.
It was after that that things got worse and he started itching and rashing so has been on 2 courses of antibiotics and steroids, the first steroids seemed to stop the itching but the second one didn't. He then got a course of antihistamines and when that didn't work got a second skin scraping (no mites found in either)
So now he is getting a mite treatment shot every 2 weeks to completely ripple this out before we see the vet derm.
As he is only 23 weeks old now it has taken time to try the different treatments always thinking one would work.
The rash has completely gone now apart from scaly red wrinkly blotches at his armpits from licking, he can flare this up really quickly as we try to keep his collar on most of the time, he knows he is not supposed to so he will jump into his bed on the floor to hide lick and scratch when is almost always sitting on my husband or me. The hair is growing back well and is very White as is his head so his new colouring is coming through.
His hair is quite thin all over and the White is really soft, when he matts it is like the black puppy hair is strangling the White fluffy hair.
More recently he has been rubbing and scratching his eyes and muzzle as soon as he gets a collar break. He loves us to scratch his face but hates getting it combed, he gets combed every day.
If current treatment doesnt work our vet will refer us for the derm.
I am hoping he is not allergic to my two birds a cockatiel and a budgie.
As far as environment I have changed everything I can think of and have tried moving the birds to the kitchen, but as he has full access to the ground floor he goes in to visit the pm anyway cos he loves watching them.

Here's something that just came to mind after reading above. I'm not sure if you use the same mite stuff that we do in the U.S. - but here, following a regimen of treating for mites - a systemic yeast infection is pretty much guaranteed. In fact, many vets tell their clients that it's pretty much a give that yeast will develop following completion of mite treatment.

So, maybe it'd help to do a current skin culture of the skin, grow it out for 10 days and see if yeast is present. If it is, vets here will usually treat systemic yeast w/ Diflucan (fluconazole) for a couple weeks.

I hope you go to that vet derm - vet derms are simply amazing!

Thanks for this feedback. I have been researching thyroid issues, I am not sure if the fact he humps his blanket a lot is a factor here, he has done this since about 10 weeks old, which seems very young. He is six months old today poor wee thing. The mite treatment has been the most recent but I will talk to the vet about thyroid and yeast next visit.