Dog Clippers Not Cutting Hair? 7 Causes and How to Fix Them

Quick answer: Dog clippers not cutting hair is almost always a blade problem, not a motor problem. Dry blades, hair packed between the cutters, dull or chipped teeth, heat, or a worn blade drive are the usual causes. Clean and oil first, then try a second sharp blade. If a fresh blade won’t cut either, replace the drive or call for service.

The motor hums, the blade moves, and the coat just folds over instead of falling away. Frustrating. And a clipper that chews hair instead of cutting it pulls on the skin, which dogs remember the next time the buzzing starts.

So I’d fix this before the next session, not halfway through it. The good news? Most of the time the fix takes ten minutes and a bottle of clipper oil.

Which Kind of Clipper Do You Have?

This matters. When I compared the Andis and Wahl manuals side by side, the two common designs failed in slightly different ways, and each manual gave its own fixes.

• Detachable-blade clippers (the Andis AGC2 is a classic example) take snap-on blades that lock onto a hinge. When these stop cutting, the blade itself or the blade drive underneath it is the usual suspect.
• Adjustable-blade clippers (many Wahl models) have a fixed blade set held on with screws, a lever that changes cutting length, and on some models a power screw. Here, alignment and the power screw come into play.

Not sure which you own? I’d check the model number on the housing and pull up that model’s manual before you loosen a single screw.

What You’ll Need

• A small stiff brush or an old toothbrush
• Clipper oil made for blades (not hair oil, not grease)
• A blade coolant spray, if your clippers run hot
• A soft, dry cloth
• A second sharp blade of the same size, if you have one

Why It Happens

Here are the causes in the order I’d check them, most likely first.

1. The blades are dry. Andis says blades should be oiled before, during and after each use. Streaks, or a blade that slows down, are a sure sign it needs oil.
2. Hair is packed between the blades. Fine clippings get trapped between the upper and lower cutter, so the teeth glide over the coat.
3. The blade is dull, rusty or chipped. Wahl’s maintenance guide lists dull blades as a cause of pulling, and rusty blades as a cause of sticking.
4. The coat isn’t ready. Mats and dead undercoat snag the teeth, and a snap-on comb can catch in matted fur and pop off the blade.
5. The blade isn’t seated or aligned. A detachable blade that hasn’t locked onto the hinge, or a misaligned blade set, won’t cut cleanly.
6. The blades are too hot. Heat builds fast on close-cutting blades, and a hot blade is uncomfortable for the dog anyway.
7. The blade drive is worn. On detachable-blade clippers like the Andis AGC2, the drive is the part that moves the blade back and forth, and it wears out.

How to Fix It

Before any of this, switch the clipper off and unplug it. Andis’s safety rules say to unplug before cleaning, removing or assembling parts.

Step 1: Clean and Oil the Blades

Brush loose hair off the blades and out of the housing. Andis notes that hair can build up in the front cavity under the blade, and a small brush or an old toothbrush clears it while the blade is off.

Then oil. Don’t skip this step, even if the blade looks clean.

Wahl’s help center gives a precise pattern: one drop in the center of the moving top blade, one on each end of it, and one on the heel of the bottom blade on each side. Run the clipper briefly to spread the oil, switch off, and wipe the excess with a soft cloth.

Don’t swap in a spray here. Andis says spray lubricants carry too little oil for good lubrication, though they work well as a blade coolant.

Step 2: Flush Out Trapped Hair

If oiling didn’t help, Andis suggests a deeper clean. Dip only the blades into a shallow pan of clipper oil while the clipper runs, and the hair and dirt packed between them should work loose.

Still not cutting? Snap the blade off.

Andis’s method is to slide the upper blade to one side without removing it from under the tension spring, wipe the surface between the blades with a dry cloth, and add a drop of oil where the blades meet. Repeat on the other side, then center the upper blade again.

Step 3: Try a Second Blade

This is the test that saves money, and in practice it’s the one I’d never skip. Andis says to try more than one blade before blaming anything else, because the blade you’re using may simply be dull.

If a fresh blade cuts fine, the old one is done. Wahl lists dull blades, rusty blades and broken or bent teeth as reasons to replace a blade set right away, and it says to always replace both blades of a set together. Some sets can be resharpened, according to Andis, so ask the maker before tossing a good one.

Step 4: Check the Seating and Alignment

For a detachable blade, Andis’s instructions are to slide the blade bracket onto the hinge and, with the clipper turned on, push the blade toward the clipper to lock it.

Adjustable Wahl clippers are different. Wahl’s guide says the points of the top blade teeth should sit 1/32 to 1/16 inch (0.79 mm to 1.59 mm) behind the bottom blade teeth and run parallel to them, so the clipper doesn’t cut too close or let the moving blade touch skin.

That gap is tiny, and honestly, if you’re not comfortable with it, I’d leave alignment to a service center. After aligning, it says to switch the clipper on and off a couple of times and recheck.

Step 5: Cool the Blades

Andis says to check blade heat often, especially on close blades. If they’re too hot, it suggests a coolant followed by clipper oil, or simply swapping to a second blade of the same size, which many groomers do.

My rule of thumb: when you touch the blade to the inside of your wrist and it feels hot, it’s too hot for the dog. Don’t wait for a yelp to find out.

Step 6: Prep the Coat

The Canadian Kennel Club says brushing before you clip removes dead hair and loosens mats. It also warns that a snap-on comb can catch in matted fur and detach, so thorough brushing matters most wherever you plan to use one.

Badly matted dogs are a different job. I’d hand those to a professional groomer rather than force a clipper through, because mats sit tight against the skin and a blade pushed under them can catch skin you didn’t mean to touch.

The CKC also says to keep the blade against the skin and gently pull the skin taut as you go, since loose skin is easier to nick. And it says to avoid clipping inside the ears, near the anus, or inside the foot pads.

Step 7: Replace the Blade Drive

If several sharp blades all fail to cut, Andis says the blade drive assembly may need replacement. On the AGC2, the manual’s steps are: remove the blade, remove the drive cap, remove the mounting screws, note how the old drive sits, then fit the new one with the drive bearing at its lowest position.

Wahl’s adjustable clippers have a different fix for a blade that sticks while the motor runs: clean and oil it, replace it if teeth are broken, and adjust the power screw to retune the clipper.

Dog Clippers Not Cutting Hair: Quick Diagnosis

What you notice	Likely cause	First fix
Streaks or slowing down	Dry blades	Oil before, during and after use
Pulls hair, no cut	Dull blade or trapped hair	Clean, oil, then try a second blade
Blade sticks	Rust or packed hair	Clean and oil; replace if rusty
Blade feels hot	Heat buildup	Coolant, then oil, or swap blades
No blade cuts	Worn blade drive	Replace drive or get service
Nicks the skin	Chipped teeth or poor alignment	Replace blades; check alignment

When to Stop and Get Help

Some problems aren’t for the kitchen table, and I think it’s worth knowing which ones before you start. Andis says never to run a clipper with a damaged cord or plug, or one that’s been dropped or got wet, and to send it to an authorized service station instead.

Stop clipping, too, if your dog is stressed or fighting the clipper. A nick or a red, sore patch of skin after grooming is a reason to call your vet, not to push on.

Want more coat-care help? Browse our grooming guides. And I’d take off the collar before you clip around the neck, so the blade can’t snag a buckle; if your dog walks better without neck pressure anyway, see whether a harness is better than a collar.

Frequently Asked Questions

Why are my dog clippers not cutting?

Most often the blades are dry, packed with hair, dull or hot. Clean and oil them, then try a second blade. If no sharp blade will cut, the blade drive is likely worn.

How often should I oil dog clipper blades?

Andis says before, during and after each use. Wahl’s pattern is five drops: center and both ends of the top blade, plus each heel of the bottom blade.

Can dull clipper blades be sharpened?

Some can. Andis says certain blade sets can be resharpened and suggests contacting the company. The Canadian Kennel Club also notes that blades need sharpening from time to time.

Why do my clippers leave lines in the coat?

Andis says streaks are a sure sign the blades need oil. If oiling doesn’t stop them, the blade may be dull or the coat may need brushing first.

Should I replace the blade or the clipper?

Try a second sharp blade first. If it cuts, replace the blade. If no blade cuts, replace the blade drive or send the clipper for service before buying a new one.

Last updated: November 10, 2026. Sources: Andis AGC2 use and care instructions (PDF), Wahl clipper maintenance guide (PDF), Wahl help: clipper pulls hair and Canadian Kennel Club: the electric clipper.