Poisonous bite - infection and necrosis?!

moppett

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Looking for advice and opinions....
Banjo one of my hounds took off after a deer on Saturday on a walk at 12.30pm - I found him at half 4, he was filthy and I noticed hair missing and a black mark behind his elbow, greenish tinge towards his armpit.
I bathed him and lightly rubbed it but it didn't budge.
Me and OH looked at it and he said he thought it could be a burn and I thought it was some kind of substance that had adhered it his skin and dried. It left no residue but felt dry and crusty. We agreed to just watch it and see.
Last night I examined it and it had a faint red ring around the outside and I was worried about infection so booked him in at vets today.
The vets hadn't seen anything like it. One thought it was even a burn but luckily they had a vet dermatologist there who said it looked exactly like an infected spider bite - from a tropical spider typically found in the Americas and not found in the uk.
The black mark was dead infected tissue.

Anyone know what could have caused this? If he was bitten whilst on the walk surely the necrosis wouldn't have set in by 4.30/5pm? He's been so bright and perky but ow he looks quiet and sorry for himself :(

I just want to know what's happened to him!
 
The areas around ports are usually the first to get colonised by immigrant species so a spider bite is quite possible. I live a few miles from an inland customs depot - they have had scorpions!
 
Did the vet take a blood test? Or a skin sample? How crazy! Was it more likely a wound that hadn't been noticed til he ran off? Having been there, done that myself, it took a few days for the skin to go black and die.
 
Banjo is really fine coated around that area and I'm convinced we'd have seen it putting harness on/off and constant cuddles etc. but in my head I can't imagine necrosis happening in what, 4 hours?
I couldn't take today off work as I had a meeting I couldn't get out of so OH took him. Which is useless as he didn't ask half the questions I would have and says he can't remember what they said. I've put a call in for the vet to ring me before clinic in the morning.
They swabbed the greeney tinge bit at the bottom by armpit to look at but OH can't remember what they found which drives me mad.
I would have thought more tests too - not even bloods?

CT I'm finding it easier to believe its a caustic burn than a poisonous spider not documented in the UK. It just makes so much more sense and I don't know why it was dismissed.
 
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