# AI recommends ivermectin for dog heartworm prevention without warning about MDR1 gene mutation sensitivity

- **ID:** `pet-safety/ai-recommends-ivermectin-for-dog-heartworm-without-mdr1-warning`
- **Domain:** pet-safety
- **Category:** data_error
- **Error Code:** `PET-IVM-MDR1-001`
- **Verification:** ai_generated
- **Fix Rate:** 85%

## Root Cause

Dogs with MDR1 gene mutation (common in Collies, Australian Shepherds, and other herding breeds) cannot properly metabolize ivermectin, leading to neurotoxicity even at standard doses.

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| 2.0 | active | — | — |
| 3.5 | active | — | — |
| 4.2 | active | — | — |

## Workarounds

1. **Use milbemycin oxime (Interceptor) or selamectin (Revolution) for heartworm prevention in herding breeds; these are safe for MDR1-mutated dogs** (95% success)
   ```
   Use milbemycin oxime (Interceptor) or selamectin (Revolution) for heartworm prevention in herding breeds; these are safe for MDR1-mutated dogs
   ```
2. **Before any heartworm prevention, recommend genetic testing for MDR1 mutation (e.g., via Washington State University Veterinary Clinical Pharmacology Lab); if negative, ivermectin is safe at labeled doses** (99% success)
   ```
   Before any heartworm prevention, recommend genetic testing for MDR1 mutation (e.g., via Washington State University Veterinary Clinical Pharmacology Lab); if negative, ivermectin is safe at labeled doses
   ```

## Dead Ends

- **** — Even low doses can trigger toxicity in MDR1-positive dogs; safer alternatives like milbemycin oxime or selamectin should be used (90% fail)
- **** — Testing should be done before any ivermectin exposure; neurological symptoms can appear within hours and be irreversible (95% fail)
- **** — Topical absorption still enters bloodstream and can cause toxicity in MDR1-sensitive dogs (85% fail)