I think I've replaced the dogs three times on our 30+ years old Kenmore by Whirlpool. The last time I bought them, I bought a quantity 2 set, so I have a ready spare set... which increases the lifetime of the parts presently in use
Just as an FYI, over the years I eventually replaced:
The solenoid fill valve 'round back, just got weak over many years.
The pump, easy to replace with the 3-sided cabinet taken off, it's bearing went, rounded out the seal, which caused it to leak into our handy utility room floor drain.
The pressure switch that senses water level for Low-Medium-High, it became finicky, I suspect the rubber diaphragm inside wore out.
The timer assembly, because the clutch in it became problematic and finally could not push/pull to start it up, this one was at the ~25+ year point.
It has gotten a lot of use all these years, and I would like it to outlive me. Can't get a heavy duty machine like those anymore. There are people in the appliance business who look for the old Whirlpool/Kenmore direct-drives with the tub tri-mount setup, who replace a part or two in them and then sell them as used machines in good condition.
We bought a used one for one of our kids in college from a lady who was living in a mobile home, she was moving out to live with her daughter. That machine (replaced the dogs once) soldiered on through college, rental houses after college, into a permanent home, where it was eventually replaced (it was still working fine) by a new fancy LG washer with all sorts of bells and whistles... The new fancy machine after a couple years blew up on spin, breaking drywall on two sides, luckily no one was in the room when it's tub suspension failed miserably. Piece of crap. Both LG and Samsung had the same idiotic design. Newer top-loader Whirlpools also went to top tub suspension from four corners, but they use all-steel suspension, with heavy steel rails up top where the shock absorbers hang from, they won't rip out.