I had some troubles.
1 - The dogs sometimes doesn't atack. I had to disconnect to work again.
2 - They stuck in some itens. They always stuck in a chair from "bibliocraft" mod. I had to "kill" them, to work again.
3 - When I used ocarina, they multiplied! The same dogs
4 - They lost track in ocarina from "Dude! Where's my horse". Some times I call them and they don't come. Or track a dog that didn't exist anymore.

Minecraft Version: 1.12
Forge Version: 8.0.99.99
Doggy Talents Version: 1.15.1.5
Java Version: 8 Update 144 64 bit
Operating System (OS): Windows 10 64-bit

Hey, thanks for taking the time to create this issue and I'm sorry I didn't get round to resolving it. I've not worked on this project for a while and have decided to archive the git repository. Fear not, there is a fork https://github.com/DashieDev/DoggyTalentsNext which might be of interest. I don't expect to be back within the Minecraft community so farewell and happy mining!