He went 3 years without having something like this happen. So I don't think it's the lawn chemicals. I just think he got bit or stung by something. He is back to normal today. He was not seen by a vet last time but was the time before. This is the 3rd time this year that this has happened. If he was still limping or licking his leg today I would have taken him into the vet immediately. He wasn't licking his paws and whatever happened was acute trauma of some kind. He is fine today, back to normal so I don't feel the need to take him to the vet. We don't have all sorts of money right now as mom just had major surgery and needs a new dental bridge and both of those are thousands of dollars.
Since he is doing fine today I don't think a vet visit is warranted.
Had he continued to vomit last night or had blood or mucous in his poo today I would have taken him.