The ring of hair around a tub drain after bath day is one of the most reliable objects in a pet household. It shows up every single time, it never quite rinses away, and it is the start of nearly every drain problem a pet owner eventually pays somebody to solve.
Hair binds with soap residue, and mineral-heavy valley water gives that mixture something to cling to. A tub that drains a little slowly in spring is a tub standing full in autumn while a wet dog waits on the mat. Toilets build their own inventory in an animal house: litter that got flushed, wipes labeled flushable that behave otherwise, and the small toy a curious cat fished out of the bowl. Outside, the hose bib used for weekly grooming racks up more cycles in a year than the rest of the yard's plumbing put together.
Clinics and boarding kennels run the same story at industrial scale, which is why the topic is worth raising with pet owners in the first place. Runs get hosed down daily, grooming tubs handle coat after coat, and laundry moves through hot water all afternoon. Anybody who has watched a groomer clear a trap has seen the household version of the problem sped up. Domestic bathrooms simply take longer to reach the same place, and a house with two large dogs gets there faster than most owners expect.
One habit is worth changing outright. Caustic drain openers sit in standing water in a tub or a sink an animal can reach, and the residue does not vanish with a single rinse. Mechanical clearing, a hair catcher over the drain, and a latch on the cabinet where cleaning products live are all duller and considerably less risky. If an animal may have licked or stepped in any of it, ask your veterinarian rather than waiting to see what happens.
Once a clog has moved past what a hair catcher can help with, this becomes trade work. A.A. Cassaro Plumbing, a family-owned shop working across the valley, lists drain repair, sewer line work and leak detection among its services, which covers the usual progression from a slow tub to a line that needs a camera down it. Owners with a house full of animals may find that a sensible number to have somewhere.
Two small jobs for this weekend: fit a catcher over whichever drain you use for baths, and run the hot tap in that bathroom for a minute before you start, so shampoo and loose hair move through the trap instead of settling in it.