I have a 6 month old tea-cup chiuahuah. About 4 days ago i had to take him to the vet because he got into chocolate, they had to induce vomiting and they took blood tests but everything was ok. Tonight i put him in the bathroom to eat his dinner and when i went to go get him i found a very small amount of diarrea with a small amount of bloody mucus. is this serious, should i take my dog to the hospital or wait and see if it happens again?