Welcome to Merrick Animal Hospital
Your Veterinarian in Brookfield IL
Call us at (708) 485-6500

Pet Emergency? Call us right away at (708) 485-6500!


For over 80 years, the people of Brookfield, IL have been entrusting their pets to the compassionate care of Merrick Animal Hospital. We are passionate about animal health care and are committed to delivering the highest quality veterinary services available. We achieve this goal by promoting responsible pet ownership, focusing on preventative health care and creating health-related educational opportunities for our clients. We want to become your trusted partner in all of your pet care needs.

Merrick Animal Hospital is a full service veterinary clinic offering a broad range of comprehensive medical, diagnostic, dental and surgical services. Our system of care has been specifically developed to extend and improve the quality of life of our patients, which include just about every type of household pet – from dogs, cats and pocket pets to birds, reptiles and exotic animals. Whether your companion is covered in fur, feathers or scales, we’re prepared to provide all of the veterinary care he or she needs to enjoy a long, healthy and happy life.

We look forward to welcoming you both to our office soon!
At Merrick Animal Hospital, we treat your pets like the valued family members they are.

Check out our Podcast: The Pet Factor

Brookfield Veterinarian | Merrick Animal Hospital | (708) 485-6500

9115 Ogden Ave
Brookfield, IL 60513

Have Questions??

Contact us today!

Meet Our Skilled Team

Learn Who We Are

  • James Hosek
    Dr. Hosek has worked at Merrick Animal Hospital since 1984 and has been the owner since 2008. He also has a house call practice on the north side of Chicago, and spent several years doing relief work in and around the Chicago area.
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  • Meg Sullivan
    Dr. Meg Sullivan knew from an early age that she wanted to dedicate her life to veterinary medicine. As she considers being a veterinarian her calling, Dr. Sullivan is very grateful to be able to combine her love for animals, as well as that for science and medicine, into her daily life. Dr. Sullivan grew up in the Chicago suburb of Wheaton, Illinois, and obtained her undergraduate degree from Augustana College. Upon graduating from the University of Illinois College of Veterinary Medicine, Dr. Sullivan worked in both the Chicagoland area and central Illinois before finding her home at Merrick Animal Hospital.
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  • James Antonicic
    Born and raised in Westmont, Dr Antonicic has always been drawn to animals. Besides the family pets of a dog, a cat, and a rabbit, he would become the temporary guardian of garter snakes caught in the field, tadpoles caught in the pond, and anything else his mother would let him bring in the house. While studying biology at Illinois Wesleyan University and considering a possible career in ecology, he decided that veterinary medicine was a far better fit for his passion for animals. From there, he went on to veterinary school at the University of Illinois, graduating in 1994 and returning to the western suburbs to begin practice in a clinic that treated dogs, cats, and all manner of exotic animals. Exotic animal medicine remains one of Dr. Antonicic’s favorite pursuits. He enjoys the challenge of treating these unique pets, and has worked with birds, snakes, lizards, turtles, tortoises, ferrets, rabbits, guinea pigs, sugar gliders, prairie dogs, hamsters, gerbils, rats, mice, and the occasional chicken. Not only does he make sure the pet is healthy, but he makes sure the owners know all the food and housing choices needed to keep these pets from needing to come see the vet too soon!
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  • Nathan Horowitz

    Dr. Nathan Horowitz was born in the suburbs of Boston and grew up there, hanging out at a lake and helping take care of cats for a local rescue group. In his mid-teens, his family relocated to Albuquerque, New Mexico, where there is no lake but still plenty of opportunities to work with animal rescue. He was homeschooled through high school, spent a gap year abroad, then studied bioethics at American Jewish University in Los Angeles. While in L.A., he did volunteer work at an animal shelter and found a feral mom cat with 3 kittens living under the house he was renting. One of those kittens still lives with his parents.

    In 2013, he entered the University of Illinois veterinary medicine program. This was not a big surprise to anyone who watched him grow up and had the opportunity to see his deep empathy for animals. One of the family cats, Kaylee, joined him at school. Kaylee was soon joined by River and Zoe, forming a formidable feline triumvirate. While practicing veterinary medicine in the Chicago suburbs, he also adopted Saffron, a Golden Retriever/Setter mix, thus giving him an excuse to take long walks every day.

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Read What Our Clients Say

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Office Hours


8:00 am-6:00 pm


8:00 am-6:00 pm


8:00 am-6:00 pm


8:00 am-6:00 pm


8:00 am-6:00 pm


8:00 am-1:00 pm




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