Sometimes — with care
Plain baked bread is safe in small bites — but raw bread dough is a genuine emergency, and raisin, garlic or chocolate breads are toxic. Know the difference.
A bite of plain white or wheat bread won’t harm most dogs; it’s just empty calories. The real dangers wear a bread costume: raw yeast dough expands in the warm stomach and ferments, producing ethanol — simultaneously a bloat risk and alcohol poisoning; raisin bread carries the grape/raisin kidney-failure risk; garlic bread is an allium delivery vehicle; and banana bread or other sweet loaves may contain xylitol or chocolate chips.
An occasional crust or small piece of plain bread is fine for a healthy dog. If your dog ate rising dough from the counter, call an emergency vet immediately — do not wait for symptoms. Same for any amount of raisin bread.
For chewy snacks, dental chews sized for your dog or a frozen carrot are far more useful.
This article is general information, not veterinary advice. If your pet has eaten something potentially harmful or shows symptoms, contact your vet or an emergency clinic immediately. Full disclaimer.