"To call the vet" means to contact or phone a veterinarian, who is a trained doctor for animals, when you need medical help for your pet. Full definition
Call a vet immediately if you see blood along with symptoms of vomiting, chronic diarrhea, dehydration, and / or lethargy. (pethelpful.com)
But also keep in mind that some dogs can develop allergies to chicken and beef, so call your vet if you observe itching, etc., after consumption. (dogcare.dailypuppy.com)
Again, there is no shame in calling your vet for help. (chowchow.org)