Species-filtered catalog + dosage-by-weight, how do you architect it?

Magento configurable products with EAV attributes for species, form factor, concentration, and a dosage calculator. Architecture:

• Species attribute, multi-select EAV (canine, feline, equine, bovine, porcine, ovine, caprine, avian, exotic). Multi-select because some drugs are approved for multiple species at different dosing.
• Form factor, tablet, chewable, oral suspension, injectable IM, injectable IV, topical, transdermal, ophthalmic, otic. Drives the PDP UI (oral has weight-based dosing slider, injectable shows draw volume).
• Concentration, mg/ml for liquids, mg/tab for solids. Used by the dosage calculator.
• Indication tags, antibiotic, NSAID, sedative, antiparasitic, etc. Drives faceted search and clinical decision-support.

Dosage calculator on PDP: vet enters patient weight (kg or lb), the calculator surfaces the correct dose for the selected species + indication. For a 22kg dog needing meloxicam (NSAID, dose 0.1 mg/kg q24h), the calculator surfaces “2.2 mg per dose, take 2 of the 1mg tablets” and adds the right quantity to cart. Drives faster ordering + fewer dosing errors.

Large-animal pricing tier: equine (horse) and bovine (cattle) orders are typically larger volume + lower margin than companion-animal. Customer-group-based pricing surfaces equine/bovine SKUs at a different margin to clinics that have flagged themselves as large-animal.

Exotic-vet pricing: exotic vets (reptiles, birds, fish, small mammals) often need off-label dosing + smaller pack sizes. A “exotic-vet” customer group unlocks small-pack SKUs hidden from companion-animal clinics. Niche but high-loyalty.