Foxtail in my dog's nose?

So I asked a question previous to this, and I'm thinking my dog has a foxtail in his nose. It could have been lodged in since Monday (so it has been about 4 days since, he had blood near his nose/mouth and sneezed a lot) but another could have easily entered his nose because our yard was covered with foxtails; even now some can spread with the wind so getting rid of them is not a guarantee that my dog has a completely foxtail-free environment. The problem is, I went to the vet and he said that my dog didn't have foxtails because he wasn't sneezing and he checked his fur/ears but not his throat/nose. I left satisfied, but my dog has started to sneeze again...this morning 12 times in a row. Could it be allergies? His nose is runny and sneezes intensely once in a while. I read somewhere that dogs can seem like they are okay because they stop sneezing, but that could be because the foxtail is in the sinus cavity. I don't know if I'm being too paranoid, but any valuable information would be appreciated. Is there any way I could use a home remedy to help? What are the chances that he will die if a foxtail is inside of him? What's the difference between a dog sneezing because of allergies or because of a foxtail?