About a month ago my dog started struggling to go to the toilet and licking his bum a lot. I read up and started giving him a bit of ginger and olive oil in his feed to help him pass his poo. The problem has come and gone a couple of times since then. A few days ago I found a small slug next to a bit of poo on the stairs, I thought he had just brought it in with him. Earlier today I saw something dark on his coat (near his bum) but thought it was just a leaf and ignored it. He went to sleep on the bed and I noticed a while later that it had crawled off and left a red trail (blood?) on the white bedding. I mentioned it to my husband and he said he found one the other day too. I took him to the vet and explained what had happened but I think the vet thought I was a bit mad! He examined him and some of his poo (which didn't have any in, I had stupidly flushed away the slug I found). He gave him a wormer which he was due to have anyway. My dog has since been sick and had diarrhoea (but no sign of slugs). I'm not sure if they were caused by the slugs or the wormer! He has been sick a few times over the last few weeks (maybe once or twice a week) but we've only had him a couple of months so I figured maybe we'd just fed him something that didn't agree with him. I'm certain that the slugs are coming from his bum and I found this old thread on here: http://www.petforums.co.uk/dog-health-nutrition/9478-our-dog-has-dog-poo-snails.html The last post says it's an intestinal fluke and that the vet can treat the infestation. There's a link to a picture but it's not working. I'm really worried, the vet didn't seem to believe me. How can we check for any kind of infestation??