I crafted a few pet carriers but i can't get them to work, I right click or right click + shift on the pet but it just does nothing.

See satyrnidae/wolf-armor-and-storage-legacy#95

It looks like wolfarmor was taken over by someone else and its API completely reworked, aren't it?

well, the API was reworked at least. It now uses mixin classes instead of capabilities. I'll see if I can create a PR

Looks like the api isn't needed anymore. PR #90 should fix the issue.

I also have Wolf Armor mod installed and I've noticed this error every time i right click using the pet carrier:

[Server thread/FATAL] [minecraft/MinecraftServer]: Error executing task
java.util.concurrent.ExecutionException: java.lang.NoClassDefFoundError: com/attributestudios/wolfarmor/api/util/Capabilities
at java.util.concurrent.FutureTask.report(Unknown Source) ~[?:1.8.0_251]
at java.util.concurrent.FutureTask.get(Unknown Source) ~[?:1.8.0_251]
at net.minecraft.util.Util.func_181617_a(SourceFile:47) [h.class:?]
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:723) [MinecraftServer.class:?]
at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:397) [nz.class:?]
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:668) [MinecraftServer.class:?]
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:526) [MinecraftServer.class:?]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_251]
Caused by: java.lang.NoClassDefFoundError: com/attributestudios/wolfarmor/api/util/Capabilities
at sophisticated_wolves.compatibility.CompatibilityWolfArmor.storeWolfItems(CompatibilityWolfArmor.java:21) ~[CompatibilityWolfArmor.class:?]
at sophisticated_wolves.item.pet_carrier.SophisticatedWolfPetCarrier.getAdditionalData(SophisticatedWolfPetCarrier.java:68) ~[SophisticatedWolfPetCarrier.class:?]
at sophisticated_wolves.item.pet_carrier.ItemPetCarrier.getPetInfo(ItemPetCarrier.java:80) ~[ItemPetCarrier.class:?]
at sophisticated_wolves.item.pet_carrier.ItemPetCarrier.func_111207_a(ItemPetCarrier.java:57) ~[ItemPetCarrier.class:?]
at net.minecraft.item.ItemStack.func_111282_a(ItemStack.java:391) ~[aip.class:?]
at net.minecraft.entity.player.EntityPlayer.func_190775_a(EntityPlayer.java:1220) ~[aed.class:?]
at net.minecraft.network.NetHandlerPlayServer.func_147340_a(NetHandlerPlayServer.java:1075) ~[pa.class:?]
at net.minecraft.network.play.client.CPacketUseEntity.func_148833_a(SourceFile:69) ~[li.class:?]
at net.minecraft.network.play.client.CPacketUseEntity.func_148833_a(SourceFile:13) ~[li.class:?]
at net.minecraft.network.PacketThreadUtil$1.run(SourceFile:13) ~[hv$1.class:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) ~[?:1.8.0_251]
at java.util.concurrent.FutureTask.run(Unknown Source) ~[?:1.8.0_251]
at net.minecraft.util.Util.func_181617_a(SourceFile:46) ~[h.class:?]