Why your dog sheds so much in spring and fall
Some time in spring you notice that the black jumper is no longer black, there is a drift of fur behind the sofa, and your dog seems to be producing more of itself than should be physically possible. Then it happens again in the fall.
This is normal, it is temporary, and there is a specific reason it happens when it does.
Many dogs have two coats, not one
Double-coated breeds — Border Collies, Huskies, Golden Retrievers, German Shepherds, Corgis and plenty of mixes — have a top layer of longer guard hair and, underneath, a short, dense, soft undercoat that does the real work of keeping them warm or cool.
Guard hairs turn over slowly all year. The undercoat does not: it comes in thick for winter and is released in bulk when the seasons change. That is why shedding arrives as an event, often called “blowing the coat”, rather than a steady trickle.
It is mostly about daylight
The main trigger is the change in day length, not the thermostat. That is also why dogs who spend most of their time indoors, under artificial light, often shed at a lower level all year round instead of in two clean waves.
What actually reduces what lands on your furniture
Nothing stops shedding. The hair is coming out either way. The only thing you control is where it goes.
Brush more often, for less time. A few short sessions a week move far more undercoat than one long monthly effort, and they do not exhaust your dog’s patience.
Work on the undercoat. A deshedding brush reaches the soft layer underneath; a regular brush mostly smooths the top.
Capture it at the source. A brush loosens hair, but whether it then lands on the floor or gets collected is a separate question. That is the whole argument for a grooming vacuum: the hair goes from the coat into a sealed canister without floating around the room first.
Do not shave a double coat to stop shedding. The undercoat grows back, often unevenly, and the coat stops doing its job of regulating temperature. Brushing is the answer, not clippers.
Check the food. Coat quality tracks diet closely. It is the slowest lever, but it is real.
When shedding is worth a vet visit
Seasonal shedding is even: the coat thins overall and your dog is otherwise their usual self. Call your vet instead if you see bald patches, red or flaky skin, constant scratching or licking, fur coming out in clumps when you barely touch it, or shedding together with weight loss, low energy or a change in appetite.
The realistic expectation
A dog that sheds heavily will keep shedding heavily. What good grooming changes is the destination: a few short sessions a week are the difference between fur in a canister and fur on everything you own.