LouLu 9%23 chihuahua looks like a Trekkie in this Size S wrap- LOVE IT! Helps calm her instantly, gives her comforting, wise vibes - like Spock! But Please Be Advised, there's a Neck-hole sewn in, fabric is stretchy, pop head thru, then the chest and tummy body is wrapped with adjustable velcro. Flexible forgiving design, also fits my 15%23 terrier, kinda- neck is ok (his 14in) but it's a stretch to reach the velcro. Neck is kinda big on LouLu (her's 13in), so cant leave this on her unattended for long, she wiggles arm/s thru so its a skirt Not safe too tight. She likes wearing this wrap, but think of it as Therapeutic to be used as needed in small doses. ps purple is brilliant! fabric is thick stretchy like top-shelf quality workout wear.