We found out that Bear our toy chihuahua has demodex mange due to bad blood line any suggestions?

We found out that Bear our toy chihuahua has demodex mange due to bad blood line, but now I have this baby and we used a dip the vet gave us and it nearly killed him and cost us 1000.00 at the emergency vet hospital… They say his immune system is compromised so any ideas on how I can boost it? Vitamins? etc…and only serious answers PLEASE! My bear depends on it!
When researching Mitaban we found out that it should not be used on small breeds, also the vet used a lyme dip…We aren’t mad at the vet we just need tips on trying to boost his immune system…

Dips are very outdated these days and contain very harmfull ingredients. A safe treatment is Ivermectin (oral or injectable). It also treats other internal parisites. Small dogs are easily disturbed by treatments. Make sure he is well hydrated and be aware of his activity level; they can become hypoglycemic. Call a vet with concearns.

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