TH8s being forced to learn other attacks that aren't mass dragons would make this a great patch. If it works out like that.
Right now some of our TH8s just declare that they can't attack a tough anti-air base and a TH9 will have to take it
None of us have anything viable to attack with other than drags. It takes a bad base for L4 hogs to work. None of us have Pekkas upgraded so we could throw out a weak Goxxxx for 2* but if we're doing that, may as well just spam drags for the 2 and then wait until later in war when a TH9 has to come clean it up anyway.
I'm going to be brutally honest here. Most TH8s suck at hog attacks - they can't read bases for traps and can't predict hog pathing because they've spent all of their TH7 and TH8 wars using dragons. It has to be specifically anti-hog for you to not have a good shot at the 3-star with Level 4 hogs. Get your hogs to that level and start using them. And actually, Level 3 hogs can take out bad, low-level TH8s.
A basic build for hogging is 6 barbs, 1 giant, 6 wizards, and 28 hogs. This gives you 25 more spots, which can be varied depending upon the base. If you know there is a dragon in the clan castle, pack another giant or two - so the dragon can lock on to the giant while it gets killed by your wizards. If there are tons of spring locations, maybe you want 5 more hogs. You might need more barbarians to get through trash buildings where you want to lure. Whatever. The more you hog, the more you'll know what troops are needed.
Your clan castle should contain 2 witches and a barb. Combine this with your barbs and a few of your wizards, and you have the perfect kill squad for anything other than a dragon - against which I would use a giant and wizards and mentioned above. If you launch your hogs from the same corner as where you lured their cc troops, your kill squad turns into a cleanup squad.
Once their cc troops are gone, you only have to worry about giant bombs taking out your hogs, but if you have heal spells dropped on giant bomb locations, a single one will not destroy your attack. Obviously, the double giant bomb hits will wipe your hogs out, so you need to cope with those. Either detonate one of them at a time, avoid the area altogether, or expose the bombs with a small amount of hogs.
As with anything, hogging takes practice to get decent at it. Once you are competent, Level 3 hogs can wipe out any TH7 and most TH8s with low level defenses, and Level 4 hogs can destroy any TH8 that isn't an anti-hog design.