The content on this page is specifically geared towards the Extra Small SitGo, Small SitGo, & Medium SitGo Dog Wheelchair.

Sitgo Size Chart 

Below is the SitGo dog wheelchair sizing chart to measure your dog with and ensure the proper fit and size purchased.

What's Included with your Sitgo Wheelchair

Let us begin with the assembly by checking out all the pre-assembled parts and tools.

Sitgo Pre-assembled rear support dog wheelchair

Above: Pre-assembled dog wheelchair parts.

Cart Frame Assembly

Above: Cart Frame Assembly  (A)

Left and Right Wheel Assembly




Above:  Left and Right Wheel Assembly (B)


Front Harness

Above:  Front Harness (C)Rear leg straps 

Above:  Rear Leg Straps (D)



Assembling the Wheelchair


Fully Assembled Sitgo Rear Support Dog Wheelchair


Above: Fully assembled Sitgo rear support dog wheelchair

To attach the left and right wheel assemblies:

  1. Remove rubber end cap from the end of the right wheel assembly (B). Rubber end caps from left and right wheel assemblies
  2. Loosen the thumbscrew on the right side arm connector in the cart frame assembly (A).  Wheel bar thumb screw on the cart frame assembly
  3. Line up top of round wheelbar assembly to scored line like so to ensure that thumbscrew lines up into corresponding divot.  Bolt for securing the wheels at the proper height
  4. Tighten thumbscrew with pliers or visegrips securely to avoid any slippage. Tighten thumbscrew with pliers
  5. Make sure the rubber stops on the wheel assemblies (B) are facing the rear end of the wheelchair.  Rubber stops on the wheel assemblies  - Facing out
  6. Return rubber end cap on the wheel assembly.  Verify rubber end cap on the wheel assembly
  7. Repeat 1 through 6 to install the left wheel assembly to the cart frame assembly.

NOTE: When adjusting height, check your pet from various angles especially from the side. Make sure your pet’s back is level.

To adjust wheelchair length:Adjust Sitgo Wheelchair length

  1. Loosen socket set screws on upper part of side arm connector with hex wrench.
  2. Adjust length by pulling or pushing the side arm.
  3. Repeat on other side arm. Make sure to align both sides.
  4. Tighten socket set screws.
  5. Loosen socket set screws on left and right small rear harness assembly using hex wrench.
  6. Adjust position by pushing forward or backward along the side arm.
  7. Tighten socket set screws with hex wrench.

NOTE: Check the length of the wheelchair’s side arms. While your pet is standing still and with its forelegs legs straight, the side arms should end right behind the forelegs or up to the point of shoulder.

To adjust wheelchair width:  [start here]

  1. Loosen and remove socket button head cap screws on the rear harness bars using hex wrench. Loosen and remove socket button head cap screws
  2. Move the rear harness bars to desired width. Make sure that at least two holes on right rear harness bar are aligned to two holes on left rear harness bar. Sitgo rear harness bars to desired width
  3. Return socket button head cap screws on aligned holes and tighten with hex wrench.Sitgo return socket button head cap screws
  4. Loosen socket set screws on pivot shaft connector using hex wrench.Sitgo Loosen socket set screws on pivot shaft connector using hex wrench.
  5. Adjust by moving the pivot shaft connector and pivot shaft to desired width.
  6. Tighten socket set screws on pivot shaft connector using hex wrench.
  7. Repeat steps 4 through 6 on the other end of the pivot shaft connector.

To adjust rubber stopper and setting L-Bracket angle:

Sitgo adjust rubber stopper and setting L-Bracket angleNOTE: This comes pre-assembled correctly from the factory - this section included for your reference only in the unlikely event that the wheel assembly goes out of line and needs to be re-calibrated.

  1. Slightly loosen the nut between the L-bracket and the Rubber Stopper bar. The L-bracket should be loose enough to be moved but not loose enough to slide on its own. Sitgo L-bracket and the Rubber Stopper bar
  2. Place plastic wheel acuator alignment tool as shown in diagram to recalibrate properly. 
  3. Re-tighten the nut carefully, make sure not to move the position of the L-bracket. You can use the rubber stopper bar to keep the L-bracket from moving while you tighten the nut.
  4. Make sure that the rubber stopper bar can move freely without excessive play.

HINT: If the Angle Bracket keeps moving away from its intended position when you tighten the nut, adjust the Angle Bracket a bit off your intended position so that when you tighten the nut the Angle Bar will move slightly to the intended position.


To switch the SitGo function to different settings:Sitgo function settings

  1. The SitGo’s collapsible setting is locked when shipped from the factory. Once you have adjusted it to your pet’s size and once your pet has acclimated to using a wheelchair, you can adjust or completely remove the bolt shown above to activate the SitGo’s collapsible feature. Please note that the spring tension will need to be adjusted for the weight of your pet (see 'Adjust for the weight of pet.' below)
  2. To release the SitGo function from its non-collapsible setting to the collapsible setting, loosen the number 3 bolt indicated in the image above until you are able to collapse the wheelchair all the way down.Release the SitGo function from its non-collapsible setting
  3. To return the SitGo function from the collapsible to the noncollapsible setting, while the wheelchair is fully upright fully tighten the number 3 bolt indicated in the image above then fully tighten the jam nut. A longer 10-24 bolt may be used if needed. They may be placed on either side of the bracket.
  4. To allow the wheelchair to collapse but stop it from going back to its full upright position, tighten the number 2 bolt indicated in the picture above. This setting can be used in conjunction with setting the wheelchair height if your pet is still too high for the wheelchair.

To adjust for the weight of your pet: 

  1. Hold on to the Spring Adjuster to keep it from moving. Sitgo Adjust for weight
  2. Loosen the set screw on the Spring Adjuster Loosen the set screw on the Spring Adjuster
  3. Rotate the Spring Adjuster going backward and downward. The two arms work in the same way. Their weight bearing capacity is additive. Meaning that each spring carries half the weight of the back side of the dog.
  4. Adjust the tension on the Spring Adjuster until there is sufficient tension to support your pet when standing and also when moving from sitting or lying down position to standing position. The tension should also not be too much so that your pet will need little effort to move from standing position to lying down or sitting position. This will take some effort to achieve because it will need a bit of trial and error until you find the perfect tension balance for your pet.

HINT: One method of doing this is to initially set the Spring Adjuster to a very high tension position. Then slowly adjust the tension lower while having your pet try using the wheelchair at each adjustment until you find the right tension for your pet.

WARNING:  Do not set initial tension at a very high magnitude for the S, or XS sizes. For small dogs, because the weight is low, high spring tension may launch them up from the sitting position too quickly and forcefully.

You are done with the assembly!

Video Instructions (optional)


Fitting your dog to the wheelchair

To put the front harness on your pet:

  1.  Hold on to the Spring Adjuster to keep it from moving. Loosen the straps of the front harness
  2. Unclip the front leg strap (red strap). 
  3. Guide your pet’s head thru the two black straps until middle black strap reaches your pet’s upper chest below the neck and the upper black strap is across your pets back shoulder area. Make sure the front leg strap (red strap) is at the bottom.Sitgo Guide dog's head through
  4. Place the front leg strap behind the front leg, across the bottom chest, behind the other front leg until it reaches the side release buckle on the other side. 
  5. Lock the clip.
  6. Using the adjuster buckle, adjust the straps to fit your pet snuggly and comfortably.

To put your pet into the rear harness:Sitgo sizing rear harness

  1. Bring the wheelchair from behind your pet and let your pet pass thru.
  2. Move the wheelchair forward until your pet fits in the middle of the wheelchair.
  3. Move the arm assembly backwards. The wheelchair will move downwards simulating the SitGo motion.
  4. Lift each hind leg of your pet and insert into the corresponding hole of the rear harness.

To fasten the front harness:

  1. Re-attach the straps of the Front Harness by sliding then through the Side Arms of the Cart Frame Assembly.
  2.  Adjust tightness of straps via adjuster buckles if necessary.

To secure your pet’s rear legs to the rear leg straps:Sitgo Front straps

  1. Use the rear leg straps tp protect your pet’s hocks and keep them from dragging.
  2. Loosen straps by pressing on the cord lock.
  3. Insert each leg to corresponding rear leg strap.
  4. Adjust to a comfortable tightness.
  5. Make sure that legs can rest at a relaxed angle.


You pet is now ready to take the first steps towards mobility.