As a hybrid of two species, Teddy shouldn’t be able to reproduce. At all. He’ll be like a Liger or a Mule. But more like Ligers, because Ligers are cuter.
Not that it would be much use though. Just something to think about.
Inuyasha, Goten, and Gohan also, shouldn’t be able to produce offspring.
To be honest, that is right but only so if we’re talking complete Earth genetics which we are not. Teddy comes from two Alien races and there is a high possibility that he has a genetic make up that can match what his partner needs to procreate.
This. Is. Awesome.