The best replacement for crate is kennel.

The best alternatives to crate are rated as following:
★★★★★  kennel
★★  line 6
★★  pen
★★  playpen
★  not to crate
★  barrel
★  memory foam
★  plastic crate
★  farinelli
★  dog bed
★  peavey
★  cage
  rebuild
  nerd block
  randall
  freight
  604 crate
  no crate
  wire crate
  vox
  babbabox
  playpen puppy
  gestation crate

Your alternative for crate is not listed? Suggest!
Speaking about crate, one probably shouldn't forget about up and away door.

Other search terms related to crate and their ratings are:
★★★★★ up and away door
You have in mind a companion for crate and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of crate in all years. Click on graph for more.
crate
kennel
line 6