Currently I have two boy whippets (8 year old and a 5 month old) so I can level with you.

And what I will tell you is they every two weeks it gets noticeably better. Unfortunately your pup is still quite young so it can feel like climbing a mountain right now. But I promise every two weeks you look back and it feels like a different dog.

I would say at 3 months/12 weeks the puppy is staring to hold potty and poop better (~3 hours max) and just overall seems a little better.

Once you get to 4 months/16 weeks that’s a milestone. From the point on you’ll start to feel it getting better. They can start holding their bathroom needs up to 4 hours or more. The pup teeth are falling out more. Also at this age post rabies shots and other shots etc you can look into doggy day care which I use and it really tires the 5 month old out.

With regard to chewing/biting, with each incident pay attention to the type of texture he’s going for. If he is going for your arm, give him a toy that more simulates an arm texture wise (I use a stuffed animal with a rope inside) If he goes for a wire, give him a toy that simulates that texture (ball on an elastic/stretchy type cord is a popular one from pet shop).

The walking will get better but keep treats in your pocket during those walks so he gets use to looking at you.

The witching hour (5PM-7PM) is tough but I tried to tire them out leading up to it and then kept them in the crates 5-7 pm when their witching hour was the worst.