I think with pigs, dogs and perhaps almost anything else in general anything’s fine for as long as they’re done within reason (in Islam and Judaism, dog ownership’s condoned if within reason), not allowed to distract you from work (if you’re in the office or classroom, do your best to focus on what you’re supposed to do) and withing moderation.
To put it this way, you want rats whether for laboratory work or food (especially if other options aren’t available), if it’s something practical that’s understandable. Likewise with marijuana, if you use it to make hemp, that’s okay too. (Or tobacco if you want to eliminate pollution.) Whatever that is, do what you want within limit and/or reason.
fynm 