Reaction profile

The FDA adverse-event record for hyperkeratosis

162 FDA adverse-event reports reference hyperkeratosis (VeDDRA 896). See the species, breeds, and drugs most associated with it below.

162
reports citing this reaction
10.5%
death-coded share
Dog
most-affected species
Oclacitinib Maleate
most-associated drug
Verify with FDA CVM →
162
Total Reports
17
Deaths
10.5%
Death Rate

Species Most Affected

Dog 143
Cat 12
Mouse 4
Cattle 2
Horse 1

Breeds Most Affected

Retriever - Labrador 11
Retriever - Golden 9
Domestic Shorthair 9
Crossbred Canine/dog 7
Shepherd Dog - German 6
Dog (unknown) 6
Unknown 5
Chihuahua 5
Boxer (German Boxer) 4
Schnauzer (unspecified) 4

Associated Drugs

Oclacitinib Maleate 32
Cyclosporine A 24
Cyclosporine 19
Trilostane 18
Milbemycin Oxime + Spinosad 12
Maropitant Citrate 11
Prednisone 10
Afoxolaner 10
Enrofloxacin 9
Cefpodoxime Proxetil 8
Metronidazole 7
Anti-Il31 Mab Mcs Lot #1283563 7
Cefovecin Sodium 6
Ketoconazole 6
Prednisolone 6
Pentoxifylline 6
Hydrolyzed Protein Diet 6
Fluralaner Chew Tablets 5
Gabapentin 5
Carprofen 4

Hyperkeratosis Reaction Insights

162 reports name Hyperkeratosis; 17 recorded a death outcome (10.5% of reported events, not a population-level mortality rate). VeDDRA code: 896.

By species: Dog (143 reports), Cat (12 reports), Mouse (4 reports). By breed: Retriever - Labrador (11), Retriever - Golden (9), Domestic Shorthair (9).

Most co-reported drugs: Oclacitinib Maleate (32 reports), Cyclosporine A (24 reports), Cyclosporine (19 reports), Trilostane (18 reports).

Read these counts as reporting volume, not risk: per our methodology, co-reporting reflects temporal association captured in voluntary submissions, not proof that a drug caused this reaction. A widely-prescribed drug will rack up more raw co-reports at an identical true rate than a rarely-used one, so compare within similar-exposure products.

Source: FDA Center for Veterinary Medicine openFDA Animal & Veterinary Adverse Events (CVM AER) · 2025

Every figure on PlainBreed is rendered directly from FDA openFDA adverse event data, no number is typed in by an editor. This page draws directly on FDA openFDA data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.