I've done a lot of international flying and have never seen a dog in the outbound security. I wouldn't think twice about bringing some goodies on the plane to eat while your in the air. As for incomming security, it depends on the country. I go to China a lot and going through their customs is unbelievably easy. You could easily bring weed in and most likley never get caught. Some guy stamps your passport, usually without even looking at you, and that's it. From what I have seen, there is no attempt what so ever at keeping people from bringing anything in to the country.

Coming into the U.S. on the other hand, is the worst as far as I've experienced. I've had U.S. customs search through all my bags simply because I told them I had brought back a few snacks from China. Even though I had it in my carry-on, willingly admitted to having it, and handed it over to them they still wanted to go through all my bags. They are serious pricks about it too. After ripping my luggage apart,and confiscating my snacks , they then yell at me for holding up the line while I was trying to put everything back in the suitcase. Like wtf else am I supposed to do. Seriously, U.S. customs agents get off on the fact that you are powerless against them and enjoy fucking with you. Don't bring anything into the U.S.

One other thing to consider when thinking about bringing anything in to another country is that what you are contemplating doing is called smuggling. Generally, penalties for smuggling are far greater than penalties for possession. Get caught with an 1/8th on the street in San Francisco and you'll get a warning, maybe a small fine if the cops in a bad mood. Get caught bringing an 1/8th through customs at the San Fran Airport and you'll do time.