I would also suggest treating your yard with ammonia-you can get big jugs of it in cleaning section of Tractor Supply/Rural King. I was told it was the only thing that really killed the parasites, supposed to be better then bleach. Other then stinking it is fine for your grass/plants. I sprayed my yard every couple of days with it and waited until it was dry to let the pup on it. I also put Gemma on probiotics to get her insides back to normal, I looked at the supplements but just went with FortiFlor (sp?), which I still give her everyday.