I just got a controllable pup, tried to fight using "next" and got this:
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Did it then work after you got that message??
Nope, had to buy a weakness potion. It doesn't show any opponents on the screen as well(Will get a picture once I use up the potion)
Try now and let me know :)
I'm having this exact same issue with my pup that i just got. Except i dont have money to buy the potion.
I am having the same issue as well with my two pups.
I had issues with this at first as well. It seems to have sorta itself out now.