Hoss,
Did a vet diagnose your dog's mange? The treatment for demodex and sarcoptes are different, but, will appear similar in terms of clinical signs? As for your ivermec, did your vet prescribe it? Be careful with that stuff. I know your dog is a mix, but, collie's (all of them) are considered risk breeds for ivermectin toxicity. Signs for that would include: hypersalivation and dry eyes.
As for the wound - I don't know if your home treatment will work or not. If it's as bad as it sounds, probably not, but I haven't seen the wound. If it has a pus-like discharge, I would def. get it into the vet b/c you can't say for sure what kind of infection it is. Lab-Collie mix also sounds kind of hairy = bad for wound infections. Hair traps TONS of little microbes that just can't wait to get into a wound and multiply a few million times.
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I'm lost in the vet school abyss - but still loving dogs... (cats too!)
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