I checked out the Buddy Belts on your link & there is the Carrot belt at a size 3.5 for the 13-15 inch girth & weight from 7-9 lbs.
The 1st question - do these have any give or stretch at all? Both the girth (15) & weight (9-9.5) are at the top of Aussie's measurements, which leaves no room for any weight gain...
Now for general ??
The 2nd question, are dogs know to slip out of these harnesses? I have a houdini doggie
And the 3rd, when measuring say for the size 4 or 5, the girls weigh in the size 4 range but girth might be in the size 5 range. What size is best to pick in your experience? tight or a little looser?
Thanks for any info...