The best replacement for guinea pigs is hamsters.

The best alternatives to guinea pigs are rated as following:
★★★★★  hamsters
★★★★  rabbits
★★  rats
★★  gerbils
★  chinchillas
★  bunnies
★  ferrets
★  hamster
★  cavies
★  chinchilla
  hamsters better pets
  rabbits better pets
  hamsters pets
  dwarf rabbits

Your alternative for guinea pigs is not listed? Suggest!
Speaking about guinea pigs, one probably shouldn't forget about scurvy.

Other search terms related to guinea pigs and their ratings are:
★★★★★ scurvy
★★ allergies
You have in mind a companion for guinea pigs and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of guinea pigs in all years. Click on graph for more.
guinea pigs
hamsters
rabbits