Companion Animals
State-of-the-art products and services that help pets live longer, healthier lives.
Fostering the Strong Bond Between People and their Pets
All pet owners want the same thing – to give their pets everything they need to live long, happy lives. MSD Animal Health is dedicated to developing innovative products and providing trusted solutions that address health needs and improve the well-being of companion animals including dogs, cats, and rabbits.
We’re proud to be part of the daily lives of veterinarians and pet owners through a range of pharmaceuticals, vaccines, and health management tools that ensure pets receive the high-quality care they deserve.
Dogs
Cats
Rabbits
Our Solutions
Parasiticides
Parasite Control that Keeps Pets Healthy for Longer
Without routine preventative treatments, parasites such as fleas, ticks, roundworms, and tapeworms can cause problems for dogs and cats. Our portfolio of parasiticides help to keep parasitic pests away.
Vaccines
Disease Prevention that Ensures Pet Well-being
Routine vaccination is an important aspect of animal healthcare. We offer an extensive range of vaccines that protect dogs, cats, and rabbits against diseases like parvovirus, distemper, leptospirosis, and kennel cough.
Therapeutics
Diabetes Management for Happy Pets
From diabetes to dermatological issues, pets can experience a wide range of health issues that impact quality of life and weaken the relationship between a pet and its owner. When chronic or persistent, these issues can make it difficult for pets to make it through daily life. We offer medicines and therapeutics that help to treat these diseases and help pets live happy, healthy lives.
Technology
Tools that Empower Pet Owners to Care for Pets in New Ways
We create digitally connected, cutting-edge technology products that provide pet owners with rich data and insights to help them enhance their pets’ quality of life and keep them healthy. Additionally, we offer pet recovery and protection services to help reunite lost pets with their owners.
Explore companion animal stories and insights
When Is Itching an Issue? Identifying and Treating Abnormal Itch in Dogs
Itching, or scratching, is common behavior in dogs and is not always a cause for concern. Like humans, dogs may experience occasional itches that prompt scratching.
When “Just One Bite” Isn’t Just a Nuisance — Rethinking Flea and Tick Care for Pets and People
Fleas and ticks present ongoing risks to both animal and human health.
MSD Animal Health Presents New Data Demonstrating the Safety, Efficacy and Quick Onset of Injectable Formulation of BRAVECTO® (fluralaner) at World Small Animal Veterinary Association Congress
Additional educational symposia offer the latest information on vector-borne diseases, infectious diseases and treatment and prevention protocols Rahway, NJ, September 26, 2025 – MSD Animal Health, a division of Merck & Co., Inc., Rahway, N.J., USA (NYSE:MRK), today announced it will present multiple
MSD Animal Health Strengthens Its Dedication to Rabies Elimination with 7 Millionth Vaccine Donation Through the Afya Program
RAHWAY, N.J., Sept. 26, 2025 – MSD Animal Health, a division of Merck & Co., Inc., Rahway, N.J., USA (NYSE:MRK), today announced it has donated more than seven million NOBIVAC® rabies vaccines through the Company’s Afya Program, since it was founded.
MSD Animal Health Presented New Data on NUMELVI® (atinvicitinib) Tablets for Dogs and MOMETAMAX ULTRA® (gentamicin, posaconazole, and mometasone furoate otic suspension) for Dogs at the 2025 European Veterinary Dermatology Congress
MSD Animal Health Presented New Data on NUMELVI® (atinvicitinib) Tablets for Dogs
MSD Animal Health Launches NUMELVI® (atinvicitinib) Tablets for Dogs – A Veterinary Innovation in Fast, Effective and Safe Targeted Itch Relief
MSD Animal Health today announced that the European Commission has approved NUMELVI™ (atinvicitinib) Tablets for Dogs.
Canine Otitis Externa in Dogs: Prevalence, Symptoms, and Care
Canine Otitis Externa, commonly referred to as ear inflammation, is a prevalent condition affecting dogs of all breeds and ages. Research indicates that up to 1 in 7 dogs seen in veterinary practice will get otitis externa at some point in their lives.
Vets and Pet-Owners See Gaps in Flea and Tick Prevention, Highlighting Need for Year-Round Care, New MSD Animal Health Global Survey Finds
Data show pet owners face difficulties with consistent compliance, while veterinarians worry about inconsistent or incorrect medication administration In the U.S. Two-thirds of veterinarians note that most pet owners do not follow year-round treatment plan, despite evidence that fleas and tick are present during all seasons RAHWAY, N.J., August 19, 2025
MSD Animal Health Presents New Data Highlighting Commitment to the Development and Study of Parasite Prevention and Treatment for Dogs at the 2025 World Association for the Advancement of Veterinary Parasitology Congress
Data to showcase depth and breadth of the BRAVECTO® (fluralaner) portfolio including the injectable and oral endectocide combination formulations RAHWAY, N.J., August 18, 2025 – MSD Animal Health, a division of Merck & Co., Inc., Rahway, N.J., USA (NYSE:MRK), today announced it will
European Commission Approves NUMELVI™ (atinvicitinib) Tablets for Dogs
NUMELVI from MSd Animal Health is the First and Only Second-Generation Janus Kinase (JAK) Inhibitor for the Treatment of Pruritus Associated with Allergic Dermatitis Including Atopic Dermatitis and Treatment of Clinical Manifestations of Atopic Dermatitis in Dogs