[Ponyup]

My dog Logan was throwing up all night last night. He woke us up at about 12:30 & my husband took him out to potty & he pooped. Then at 1:00 he chewed threw his playpen & my husband took him out again & he pooped again. At this time we noticed that their were many spots of vomit in his playpen. I stayed up with him til about 3. He didn't poop anymore but kept wanting to go back outside to eat grass. He threw up 4 more times while I was up. & at least one more time after I went to bed. He was biting at his stomach & looked very uncomfortable. If he was a horse I would say he had collic; I'm afraid it may be a blockage. He seemed a little better this morning, but the look in his eyes told me he still didn't feel good. He ate his breakfast & drank water. He also pooped a little this morning but it was very strained. I have a vet appointment at 11:30 today.

I would like opinions on what else might cause these types of symptoms.

Thanks,