I have just read this article as Willow seems to like worm casts in the grass. I was shocked by this Giant kidney worm parasite please tell me this is not in the UK. Do I need to give worm tablets are there even worm tablets for this parasite. https://culinarylore.com/other:are-earthworms-dangerous-for-dogs-to-eat/
No, this parasite does not exist in the UK. At least, if it does I've never heard of it and it's not a risk to any dog I've ever heard of...
Thank you Jo, Willow is eating everything she sees her favourites are tufts of grass stones sticks and soil. She does drop when told. Luckily she just sniffs dog poop if she comes accross it. She was on dried food and ate her own poop but that has stopped now. She is very slim and always hungry.