Cat vomited blood
Hi, my 11 year old boy cat Snowball vomited some blood this evening. He hadn't eaten since this morning, so there was no food to vomit. So, it was one of those where it is a clear sticky liquid, but this time with blood in it. It's a bit odd because one side of the vomit on the kitchen floor was the clear color, and the other side had obvious bright red blood mixed in with it. It is as if he started the puke with normal liquid, then suddenly blood came out at the end of the puke. (Or, I suppose he could have started with the blood puke and finished clear, but that seems really unlikely.) Because the same puke session produced both with blood and without, I'm thinking it is not likely the blood could have been sitting in his stomach... otherwise it all would have been red.
For the past 2 days, he has vomited up everything fed to him. I'm not sure if there was blood earlier (nothing obvious). I wasn't immediately worried because he has done this before, sometimes going for days of daily puking, only to then be fine for weeks. He's always been a frequent puker since he was a kitten.
He otherwise seems fine. He's hungry (extra hungry because he can't keep anything down), and eagerly follows me around as usual.
Any ideas? I can try to make an emergency vet visit tomorrow. But, the timing is bad; we are leaving for a week vacation this weekend. So, he either has to be all better by then, or be left for 10 days in the cat hospital. Our plan had been to board him with his sister, as we usually do, for vacation. (They can't handle being alone with a cat sitter visiting.... they freak out and start peeing and pooping everywhere.)