After 2 weeks away came back to find only 2 shoots remaining - the rest had been eaten.
So (sorry David K) but i've brought them inside and they are all trying to grow again!, keeping them safe on the sill now.
although last spring i kept my sunflowers indoors to protect from slugs and when they were a foot high, i put them next to the patio door for light and the dog ate them!
Hmmm, barbed wire may be an option this year from your little four legged furface . I thought you were going to say your dog had lifted his leg on them. Animals can be very cheeky. I have two cats and they insist in eating anything that is green. The smallest will climb up the door just to get to the spider plant on the top of the book shelf!