That's a good question, it's really hard to answer because all breeds have their own unique challenges and their own unique strengths. In a group setting specifically I get a little nervous when I see sighthounds like whippets or italian grayhounds because being around a group of other dogs can make these breeds nervous, which means their heads really aren't in the learning zone.

I also get a little nervous around primitive breeds, like shiba-inu, basenji, and similar, they tend to be in my opinion the most difficult dogs for people to learn to train because when it comes to primitive breeds they really have their own strong opinions and will not work on unfair terms, most dog breeds will keep giving you chances if you mess up during training such as forgetting to treat or giving somewhat unclear instructions, but primitive breeds aren't like that, they will end the session on their own terms if they decide you aren't working with them on an even level.

So I guess my answer is I don't have a least favorite breed to work with, but I have least favorite settings and least favorite mindsets from the humans at the other end of the leash with certain breeds that drive me insane LMAO

Thank you for your ask! It made me very happy