Seaweed — Food safety facts
Feed with care · Dogs · full breakdown on the linked food page
Very high in iodine and salt. Small amounts occasionally.
The full verdict, portion guidance and serving notes are collected on the Seaweed food facts page.
Short answer
No, it's best to avoid giving seaweed to a pregnant or nursing dog. The high salt and iodine content can be too much for her system and potentially affect her developing puppies. Skip it entirely and stick to her regular, balanced diet to keep her and her litter safe. If she accidentally eats some, watch for vomiting, diarrhea, or excessive thirst and call your vet.