If your dry hopping after your beer has fermented it should be fine.
Just try to keep it at a cooler temperature also if possible in the low to mid 60's, as most bacteria like to start taking hold at 75-80F or higher and really take off.
I usually just throw all my hops in a hop sock that i boil for a few minutes, then tie it off and spray a few squirts of starsan on the outside for good measure and throw it in.
The alcohol should prevent any bacteria from taking hold, although its probably a good idea if possible to bag and weigh down the hops so they sink to the bottom and arent in contact with any air that's possibly in your fermenter.