Momo is a dating software. You can chat with some unknown male and female friends on it, but it is generally not safe. If you are looking for a dog, you are looking for a partner, or you can find someone to be ambiguous with. Or someone who is relatively close to you.
If you have a boyfriend or girlfriend, it is very inappropriate to do these things. If you don’t have a boyfriend or girlfriend, it’s okay, but you must identify whether the other person is safe.