A dropped lunch looks like a prize to your dog. You may not know what was in it, how long it has been outside, or whether they swallowed the wrapper. Food scraps can contain toxic ingredients, and packaging can block the gut. If you know your dog swallowed something unsafe, call your veterinarian or an animal poison service with the details rather than waiting for signs. Vomiting, pain, lethargy, or loss of appetite need urgent veterinary attention.
For the next walk, choose cleaner routes at quieter times and scan the ground ahead. Keep your dog on a secure harness and a lead you can manage. Turn away early when you see rubbish. Do not pry open a guarding dog's mouth or chase them for an item, that may make them swallow it faster. If ingestion keeps happening, discuss the pattern with your veterinarian. A properly introduced basket muzzle may help prevent scavenging, but it needs a safe fit and gradual training, not a rushed first use.
Teach before you need it
Practice "leave it" with harmless objects indoors, rewarding your dog for turning toward you. In a safe area, teach a voluntary "drop" using easy toys and a valuable exchange, then sometimes return the toy. Outside, reward checking in and sniffing permitted patches of grass rather than trash. Never set out dangerous food to test the cue.
Management matters even with a trained dog. A missed packet on a dark street can defeat an excellent "leave it," so the safest walk makes fewer such encounters possible.
Sources: VCA Animal Hospitals: Eight weird things dogs like to eat on walks. Dogs Trust: How to train your dog to leave it.