The best replacement for dog is cat.

The best alternatives to dog are rated as following:
★★★★★  cat
★★  wolf
★★  cat diary
★★  deer
★  porcupine
★  bear
★  cat game
★  dog
★  human years
★  cat person
★  me
★  cat quiz
★  wizard
★  cat video
★  coyote
  two
  god new vegas
  puppy
  coyote tracks
  cat smarter
  baby
  polar bear
  girlfriend
  human
  female dog
  balloons
  boyfriend
  cat yahoo
  canine
  cat games
  iraqi
  god in dead money
  security system
  god dead money
  raccoon
  human mouth
  wolf fight
  dawg
  human hybrid
  doberman
  rattlesnake
  cat fight
  cat people
  no dog
  two dogs
  monkey
  cats
  panda
  bull
  girl dog
  dalek
  cat jokes
  towel
  cat intelligence
  cat first
  skunk
  cougar

Your alternative for dog is not listed? Suggest!
Speaking about dog, one probably shouldn't forget about blog.

Other search terms related to dog and their ratings are:
★★★★★ blog
★★★★★ hair
★★★ rabies
★★★ bone
★ blog disney
★ fleas
human face
dander
bark
You have in mind a companion for dog and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of dog in all years. Click on graph for more.
dog
cat
wolf