Animal Adventures: Dogs of Gullet Cove - Rules of Play says:

Embark on your next adventure as an intelligent canine bursting with character! These adorable dogs are fifth edition compatible and can be used in any tabletop roleplaying campaign. With these faithful friends, you can explore the Animal Adventures world with the Secrets of Gullet Cove sourcebook*, or play as an intelligent dog in any fantasy campaign. The only limit is your imagination! From a Labrador druid to a Sheepdog cleric, each pup has been lovingly designed and assigned a fantasy class. Now, they’re ready to join your adventuring party as player characters, companions, or familiars.