<human>: Holy shit, guys. I took my adorable labrador to a festival the other day and people kept trying to give him food behind my back/without asking. Only one person actually asked me throughout the whole day. 

At one point i felt him pulling at his lead and turned around just in time to catch someone about to give him half of a very large kabab roll. They looked at me like i had murdered their whole family when i immediately said "no no no no, please don't give him that". 

I was so surprised that people would do this, not just because there are so many things that are bad for dogs, but also because of how rude it is. And its not like he was frolicking around, i had him on a short leash the whole time. 

I wouldn't even pet someone elses dog without asking (Only 2-3 people actually asked to pet him at the festival- everyone else just jumped in like they knew him)

I don't take him out much to places where there are a lot of people, so i was wondering if this happens a lot?

Can you summarize the given text in a few sentences?
<bot>: Title sums it up. Also, what's the worst thing you have caught someone feeding your dog, or (hopefully)about to feed them?