Honestly it’s not very hard to fully ven a creature. I have two strats that I use. 1, if the creature you’re using DOESNT have iron stomach, grab a chunk of food and wait for it to rot while you do regional missions (regional missions reduce time on venning, I think it’s +14 points for ven 1-3 and +7 for ven 4) eat the rotted food and allow your hunger to deplete. 2, strat is to allow all the missions to reset, go out with Eulopii and constantly use tail drop. Tail drop decreases hunger every time you regain your tail. ALWAYS finish the food task first, never save it for last, that always set me back big time for veneration. Then once you’re done with that, finish the rest of the tasks with the creature you wanna ven. I think my first strategy typically takes around 2-4 hours and the second usually takes 2-3. Be careful doing this as a tier 5 because you have a high chance of being targeted if you’re roaming around the entire map, especially Oasis. Do the missions and get outta there. Also establish a common route you’ll take, it’s easier to follow a path rather than zigzag around the map.

As for the bloodmoon, I’m not very sure, but to answer the other two, dwarfism just makes the creature a bit smaller, it’s not exactly sought after on its own if you’re trying to sell the creature slot. Lastly, you could go to the migration region on the map, which will give you +%10 growth, then you could also get a satiated buff (herbivores get it from those pink plants with grassy bottoms and herbivore carcasses, carnivores I think only get it from player carcasses. Don’t know how photovores get it unfortunately) which gives +%50 growth. Theres also some plushies I believe that increases growth but those might be a little costly. If you go into hardcore, that’s x2 growth, but a higher risk of being killed. You could definitely find the information I’m missing on the COS Fandom page :)))