How to make dairy free yogies for rats?

It isn't impossible to make something like that, but it would probably be pretty difficult. If you don't already know, you need a yogurt maker to make yogurt from scratch. You can make yogurt in a saucepan, but one of the ingredients has to be yogurt to start it out, so that basically defeats the purpose. If you do have a yogurt maker, there are a lot of great dairy free yogurt recipes online.

Then to get them like yogies, you will either need to freeze dry the yogurt or I've also heard dehydrating works similarly. And again without machines it is difficult to do this. You will need a dehydrator if you want to dehydrate it. To really freeze dry it isn't possible at home, but you can try putting it in the freezer for about a week and test out taking some of the yogurt bites out and seeing if they'll stay solid or it they change from their original state (but I have heard people say it does work with some trial and error). So you'd need to do some experimenting. If you just stick it in the freezer overnight obviously it will just thaw and become liquid again when you take it out.

Maybe there's another way, but that's the only way I can think of how you'd do it. It would probably be easier just to use another treat. Yogies really aren't great for treat training because they are basically just made of sugar, plus there's the dairy issue. Although rats love them, you want a training treat to be something you can give them quite a bit of without worrying about their weight or health. Sugary treats should not be for every day usage. I have always used cereal for trick training like chex or cheerios and it has worked very well. Cheerios are very small and they can finish one in just a couple of seconds so they don't get distracted from the training, but they still will work for them. Chex and other cereals are a bit larger so if I use that I break it into pieces so it doesn't take as long to eat.

Well you can feed them little amounts of dairy. Just not major amounts.

Also, I use small bits of chocolate as my treats when my rats do well. Dark chocolate really helps when they sneeze, too.