A true case of bloat kills the animal. The animal cant keep up with the froth by burping and the bubbles in the froth are to small to pop and release the gas. Anytime a goat eats, they will create gas within their stomach but the bubbles are big enough to be popped and released. Sometimes an animal will get a huge belly but be in no real danger as long as they are able to burp and their rumin is working as it should. Still a good idea to keep a close eye on a suspected case. So I think you are doing good in that dept. And seeing how they are new to you and id guess you are feeding them something different then what they are used too, its even a better reason to keep a close eye on em. Now if you wanna be super safe, you can give them a cup or two of baking soda a day. Just pure it into a lip pan or even add it to a lose mineral salt. Baking soda is a rumin buffer and will help to keep it in top working order. Next you can put a table spoon or two of dawn liquid dish soap and water into an 8 quart bucket for them to drink from while eating (water first then soap). This acts as an bloat drench by mixing with the tiny bubbles of the froth and making big easy to pop bubbles that they can burp. Trust me on the dish soap. Our hay this year turned out to be upwards of 30% protein and if not for the soap, we would be at least a dozen goats lighter.