Crochet dog sweater

One of my dogs is a amstaff/pitbull. He freezes easily because of his short hair. I have knitted a sweater to him before, but I thought he could use one more if the other gets dirty. Here is what it looks like.

I think it's hard to find something in his size so I had to measure it for him and count how many sc I needed for his size.

I have started to make the backpart. Maybe I have to make it bigger but I have started on the middlepart to see. :)
I found the pattern for free on the internet.