lol that is a terrible reason. Also, I am more than slightly suspicious that you are a troll. But if you are not: keep food tech if you aren't confident in your other subjects. You still have time to improve on your ranking.
If you're doing fine in all your other classes and food tech is just...
Actually kinda crappy if you're working at Pizza Hut/Dominos lol.
Also, if you buy yourself a dog how's moving out gonna work? Cos you'd need the extra money to take care of your dog :/ and to find a place that allows pets. Or will you just leave the doggy with your parents?