Contact Us

Have a question or issue that needs our attention?

To report an adverse reaction, product-related problem or human exposure:

Companion Animal Technical Services
Dogs & Cats
800-224-5318

Livestock Technical Services
Cattle, Swine, Poultry, and Aquaculture
800-211-3573

Equine Technical Services
866-349-3497

Information about Merck Animal Health products:

Merck Animal Health Customer Service
800-521-5767
8am-5pm CST Mon-Fri

Microchip identification in dogs and cats, call HomeAgain:
888-466-3242
8am-5pm CST Mon-Fri

For more information on any of the subjects on the Merck Animal Health website, please fill in the form below.

For after-hours emergencies: Call the appropriate number listed above and follow the prompts.

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