As the west coast is a very popular holliday area, many accommodation facilities are available.
One of the cheapest solutions would be to rent one of the many summer houses, of which many have up to 8 beds. An extra fee might be asked for the dogs.
An educated guess about the price level for two nights, would be somewhere between €100 – 150 per person.
Booking.com will help you find accommodation. Search for Nymindegab