Ask a Dog Vet and Get Answers to Your Dog Veterinary Questions
Hello, I'm Dr. Deb and will do my best to help you today.
I'm sorry for this concern about Sammy and for this potential problem for yourself:(
Dogs can develop Listeria but it's pretty rare. Signs which might be seen include: fever, diarrhea, and vomiting, with occasional neurologic signs. Incubation is 11-70 days in people but unknown in animals.
Treatment would be antibiotics and supportive care.
Until or unless Sammy develops symptoms, though, I wouldn't prophylactically treat her with medication since she may not become sick at all...especially if she only ate a very small amount of the hummus.
I hope this helps and that you're feeling better soon. Deb