Spring shedding is a light problem before it is a coat problem. Once daylight passes about 12 hours a day, cats drop the dense undercoat they built in autumn, and the hair on the brush can double inside 2 weeks. Most of it lands on the sofa. The small share that goes down the throat is what fills clinics in April and May, and the queue lasts about 6 weeks.
Why the coat comes out in spring
Coat growth runs on photoperiod, the number of daylight hours the eye registers. Shortening days in autumn switch the body into building a thick undercoat. Lengthening days in spring switch that off, and the old coat is pushed out over roughly 4 to 6 weeks. Longhaired cats and cats that go outdoors often take 6 to 8 weeks, and they shed in bigger clumps because the undercoat itself is longer.
Indoor cats living under 10 to 12 hours of artificial light sit closer to year-round shedding in small amounts. That sounds easier, and it is, until you notice the hair arrives steadily for 12 months instead of in one 6-week wave. The yearly total ends up within about 10 percent of the seasonal shedder's.
Brush every 2 days for 5 to 10 minutes
Twice a week is not enough during the shed. Every 2 days, 5 to 10 minutes, is the routine that keeps hair out of the stomach rather than on the floor. Two tools do the work: a rubber curry or a soft slicker to lift the undercoat, and a metal comb with medium teeth to check what is left. If the comb glides through without snagging, the session is over. If it stops, work that spot for another 60 seconds.
Stroke in the direction the coat grows, in short passes, and press only hard enough to move the skin 2 to 3 mm under the tool. 10 minutes is the ceiling, not the target. A cat that walks away is finished for the day, and forcing a second pass teaches the cat to hide when the brush appears. Brush 10 minutes before a meal and follow with food. Direction and tool choice by coat type are covered in how to brush a cat.
| Coat | Weeks of shedding | Minutes per session | Sessions per week | Comb tooth spacing |
|---|---|---|---|---|
| Short, indoor | 4 to 6 | 5 | 3 | 1.5 mm |
| Short, outdoor | 5 to 7 | 6 | 3 | 1.5 mm |
| Semi-long | 6 to 8 | 8 | 4 | 2.0 mm |
| Long | 6 to 10 | 10 | 4 | 2.5 mm |
Longhaired cats need one extra step: a 2-minute check under the armpits, behind the back legs and under the collar, where a mat starts as a knot the size of a pea, 5 mm across. A mat tight against the skin should be shaved, not pulled, and scissors never go near a moving cat.
What a hairball actually is
A hairball, more accurately a trichobezoar, is a felted plug of hair and food residue that collects in the stomach and comes back up as a tube 2 to 3 cm long, often cigar-shaped and streaked with foam or bile. It comes from the stomach, not the lungs. A cat that brings one up is usually normal again within 60 seconds: hacking for 20 to 30 seconds, swallowing, a wet cough, a hair tube on the carpet, then an appetite.
That sequence is the benign version. The version worth worrying about looks different: repeated dry heaves with nothing produced, vomiting within 60 minutes of eating, or a cat that hides for the rest of the day afterwards.
Once a week is the line
Vomiting a hairball more than once a week is not a shedding problem. It is a symptom, and the usual causes are not hair at all: overgrooming from itch or pain, inflammatory bowel disease, slow stomach emptying, or a mass. In the common pattern the cat vomits hair every 1 to 2 weeks for 3 to 6 months, the hair gets blamed, and the real disease is chronic enteritis that has been progressing the whole time.
Two findings change the plan. Hair in the stool is normal and means the gut is moving it out. Hair in vomit every few days is not. Weight matters more than the hairball count: a cat losing 5 percent of body weight in 4 weeks while producing hairballs is losing muscle and fluid, not just hair. The workup for the vomiting case is in IBD and chronic vomiting, and the reason an empty stomach produces yellow fluid is in yellow vomit.
Normal shedding, or a reason to book an exam
| What you see | Threshold | Book an exam within | Verdict |
|---|---|---|---|
| Loose hair everywhere, normal appetite | 0 hairballs | 0 hours | Normal shed |
| 1 hairball a week, 2 to 3 weeks running | 1 per week | 168 hours if unchanged | Borderline |
| Hairballs twice a week or more | 2 per week | 24 hours | Not normal |
| Food or yellow fluid between hairballs | 1 vomit per 48 hours | 48 hours | Not normal |
| Bald patches, scabs, bare belly | 1 patch of 2 cm | 72 hours | Not shedding |
| Weight down, coat dull | 5 percent in 4 weeks | 24 hours | Not shedding |
| Coughing, nothing produced | 0 hair in 3 attempts | 48 hours | Not a hairball |
Fibre, water, and a 4-week test
Diet changes the odds more than any paste. Wet food at 70 to 80 percent of intake adds water that carries hair through the gut, and a fountain raises intake in many cats by 20 to 50 ml a day. Fibre works from two directions: 1 to 2 teaspoons of plain canned pumpkin a day adds bulk, while 0.25 teaspoon of psyllium mixed into wet food twice a day adds soluble fibre that moves hair out in stool. Introduce either over 5 days; a fast switch causes gas and loose stool.
Skip petroleum jelly and mineral oil sold as hairball remedies unless a vet prescribes them. They can coat the gut, cut absorption of fat-soluble vitamins, and are easy to inhale if the cat struggles. Never give a paste to a cat that is already vomiting, because it obscures the one symptom that matters. Water intake in general is worth a separate look.
Give any change 4 weeks and count hairballs on a calendar. Brushing every 2 days, 1 wet meal and fibre should cut the count by half or more. If it does not, hair was never the problem, and the next step is blood work, a weight curve and imaging rather than a stronger paste.
What to do this week
- Put the brush next to the food bowl and book 5 to 10 minutes every 2 days, at the same hour.
- Replace 1 dry meal with 40 to 60 g of canned food, and add 2 tablespoons of water to it.
- Start a 4-week calendar: 1 mark per hairball, 1 note a week on appetite and stool.
- Weigh the cat on the same scale once a month and write the number down to 10 g.
- Call the clinic if hairballs pass 2 a week, if food comes up between them, or if weight drops 5 percent.
Frequently asked
How often is too often for a cat to vomit a hairball?
More than once a week during shedding season is the line. A cat producing a hairball every 1 to 2 weeks for months usually has an underlying cause, most often overgrooming from itchy skin, inflammatory bowel disease or slow stomach emptying, and needs an exam with blood work rather than another paste.
Do hairball remedies and pastes actually work?
Most are petroleum jelly or mineral oil, and the evidence for them is weak. They can coat the gut, block absorption of fat-soluble vitamins, and are easy to inhale if a cat struggles. Brushing every 2 days, wet food and 0.25 teaspoon of psyllium do more, and none of them hide the vomiting a vet needs to see.
My cat is coughing but nothing comes up. Is that a hairball?
No. Hairballs come from the stomach and are vomited, not coughed up, so a cat that coughs without producing anything is showing a respiratory sign. Asthma, bronchitis and heart disease all look like that. Book an exam within 48 hours rather than waiting for a hairball that will never arrive.