The best replacement for service dog is therapy dog.

The best alternatives to service dog are rated as following:
★★★★★  therapy dog
★★★  companion dog
★★★  emotional support dog
★★  comfort dog
★★  assistance dog
★  guide dog
★  working dog
★  emotional support animal
★  companion
★  companion animal
  protection dog
  seeing eye dog

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

Other search terms related to service dog and their ratings are:
★★★★★ pluto
You have in mind a companion for service dog and it is not yet here? Propose!



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service dog
therapy dog
companion dog