Some things to remember when using "will" to describe present habits: - only use "will" for actions, not states E.g. My cat will meow all day long. (Correct) E.g. My cat will sleep all day long. (Correct). E.g. My cat will be hungry all day long (we don't say this). - in speech, it is usually used in response to something e.g. if your friend sees your cat sleeping, or the cat has just meowed - in formal contexts, we can use will for actions that are general truths. I think this is usually used when an action or event occurs over some duration of time. E.g. Monarch butterflies will migrate from Canada to Mexico every few years. - in any of the examples above, you can use the present tense - sometimes in speech, we use "will" to imply annoyance E.g. Person A: Hey, the toilet doesn't flush! Person B: yeah, it'll do that. Any time you are using "will" to describe habits, you could use the present tense instead. But the reverse is not always true. "Will" implies that the habit is a general truth, and even not in anyone's control. It is just what someone does. The key is having context. Using "will" in spoken English without the context of a present habit, is probably referring to the future. E.g. I shower every day. I will shower every day. (This sounds like a proper future, because you normally decide when to shower. This is a habit you are planning to start, not a present habit). He will be late for work no matter what. (Depending on context, this could be describing someone's habit, that we should expect this from him. Or it could mean that he will be late on this particular day). He will be late for work (there is no time context, so if I heard someone say this, I would understand this as future tense). He will be late for work today (only available meaning is future tense)

Without "will" you have a simple statement of fact: "My dog barks all day." "Will" makes it more explicit that this behavior is habitual: "My dog will bark all day" is like saying "my dog has the tendency or habit to bark all day". So they mean the same, but "will" states with more certainty the habitual nature of the barking.

Thanks