My dog ate a tea bag. Is it toxic or will it cause an obstruction?

Tea that contains caffeine can be toxic if ingested, and the amount of caffeine is different in different types of tea (i.e. green vs. black). For a dog Teddy's size that equates to about 180 mg. The average bag of black tea contains about 40 mg of caffeine, so my guess is that Teddy is not at risk for toxicity. If you think the bag is larger or may contain more caffeine than black tea I would recommend contacting ASPCA poison control at 1-888-426-4435.

If it was a typical size tea bag I doubt you would need to worry about the bag or string causing an obstruction, but you should still monitor for vomiting, decreased appetite or diarrhea over the next few days. If it happened in the last hour you could also consider taking him to an emergency veterinarian to have them induce vomiting.