Sun Lines By Sunshine K9s

Unique, Custom 1/4″ ROUND BioThane® Dog leashes and long lines

Custom Round Biothane Leashes


These unique custom ROUND BioThane® Dog Leashes are 1/4″ in diameter and are a great alternative to leather and nylon leashes.


Available in:

Great for:

DRAG LINES for Nose Work, Tracking & Schutzhund / IPO :

Custom Round BioThane Drag Line

Drag lines are basically long lines with no handle at the end so there is less chance of the line getting caught on something while it's dragging along the ground.

Round BioThane® makes great drag lines for dog training and for canine sports requiring long lines.

Distance markers can be placed at requested intervals so you can easily keep track of the amount of line let out.

customize and order

it's really easy

to order your own Custom Sun Line Round BioThane Dog Leash and Line!


DECIDE ON WHAT LEngth you want:

Our Shopping Cart below separates the lines into four groups based on lengths:

1) Short Line: This is a short line, from 3′ – 8′ long.

2) Medium Line: These lines are from 9′ to 20′.

3) Long Line: These lines are from 21′ to 30′.

4) X-L Line: Very long, from 31′ – 40′.

** If you are looking for a longer or shorter length,
email me. **

The length of the leash is measured in FEET and INCHES from the end of the snap where it attaches to the line to the end of the line, handle or stop.

round biothane leashes come in many colors

Choose from these available colors.

From Left to Right:
Red, Neon Pink, Blaze Orange, Yellow,
Neon Green, Teal, Blue, Purple, Black &
Brown (limited availability- email first)

3:  SNAP


Small Snaps

Best for small dogs where you want a light-weight snap, such as Shih Tzus, Yorkies, Coton de Tulears and Chihuahuas.
Choose from Solid Brass or Nickel Plated Brass
Length: 1.75" / Weight: 0.4 oz (about 2 Quarters)

Large Snaps*

Our Stainless Steel snaps have the largest eye for the thickest D or O-rings and can handle the toughest pullers such as Rotties, GSDs, Mastiffs and other strong breeds..
Choose from Solid Brass or Stainless Steel
BRASS: Length: 3" / Weight: 1.1 oz (about 5 Quarters)
SS: Length: 3.25" / Weight: 1.4 oz (about 6 Quarters & 1 Nickel)

Medium Snaps

Great all round snap for all dog sizes, even strong pullers.
Choose from Solid Brass or Nickel Plated Brass
Length: 2.5" / Weight: 0.9 oz (about 4 Quarters)

Trigger Snaps*

These trigger snaps are a great choice for people with large or arthritic hands, or if you just want an easier to use snap.
Nickel Plated Brass only
Small: Length: 1.875" / Weight: 0.8 oz
Medium: Length: 2.5" / Weight: 1.4 oz

* = Large Stainless Steel snaps and Trigger Snaps are an additional fee.

Bolt snaps are generally made in three metal types:



All lines come standard with an 8″ handle.

You can customize further by choosing a different option:

Round biothane leash with o-ring
round biothane long line with stop at end

Sun Lines Store

  • Click on the item below corresponding to the length of the line you want.
  • When the page opens, choose your color, snap & handle options and any other customization you want.


Want something more customized?

Do you need a length or option that's not listed in our Online Shop?