However, some diseases can jump between dogs and humans, and one such illness was just confirmed in Iowa.
The zoonotic bacterial disease can be spread through contaminated reproductive fluids.
The department says the threat to most pet owners is very low.
If pet owners have recently acquired a new, small breed dog from Marion County, they should contact their veterinarian.
Heinz said someone contacted them about the auction and said this particular commercial breeder was closing and would have some of the older dogs up for adoption, which is why they chose to attend.
In dogs, signs of the disease include infertility, spontaneous abortions and stillbirths. Dogs with inflamed lymph nodes, acting abnormally, losing weight, or are lethargic may be infected.
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The Nasdaq added 0.1% to 7,916.94, while the Russell 2000 index of small company stocks picked up 0.2% to 1,572.99. "It's no big deal".
Dealing with fever, night sweats, headaches, back pain, and other flu-like symptoms? "Arthritis (joint pain) and re-occurring fevers may occur with long term infection. Rarely, cases of brucellosis can involve the nervous system, eyes, or heart", reports the Center for Food Security and Public Health.
Humans infected with the disease, according to The Mayo Clinic, can expect to "take antibiotics for at least six weeks".
In the right conditions, canine brucellosis can survive for months. Breeders should wear protective clothing, including gloves and masks, when assisting in the delivery of newborn puppies.
AHeinz57 Pet Rescue & Transport, Inc., an animal rescue organization in De Soto, Iowa, has quarantined 32 dogs purchased at an auction from a breeder while they undergo testing.
The disease, which can be spread through reproductive fluids, is believed to only infect dogs and humans. "Therefore, we have closed our shelter building for the next 30 days", the adoption service wrote in a Facebook post.
"They spent their lives in these little tiny boxes breeding over and over and over, and to finally get out and get some freedom and have to die would be so tragic and terrible", Heinz said.