Finally some good advice, Duo! No more of this throwing of bowls. Or beds...
I agree; good advice. Yes, please don't give them chocolate. They are way too precious to get sick.
To my knowledge, in this case, 에게 would be a particle that means the equivalent of "to" and the suffix ~지 마 means "don't" (literally in this case 주지 마요, "give-dont".)
에게 means that you're doing (usually giving) something to somebody. Thats why 에게 is usually used with 주다. So, 개에게, to to dog.