Grimlock ♥ Ultra Magnus

I'm taking care of Dean this week since my sister is on vacation with my parents.  So today I woke up, went downstairs, and freaked out - cos there's blood on the floor.   I cleaned up the couple drops on the wood, took pictures of the small smears on the tiles, but I wasn't able to get Dean to open his mouth fully so I can't tell if he's bleeding from his mouth.   He's frisky, he ran the hell away from me when I tried to turn him over, and it doesn't look like he was bleeding a lot. 

Should I be worried?  

I don't have the vet's phone number, so I called my sister to ask if she thought I should call the vet.   

I'm kinda freaking out, though.