I am well prepared to be crucified here, but I really want genuine advice on what we should do.
Ddog is 11.5 months old, a hated MN crossbreed (labradoodle). We've had her since 8 weeks. We've done puppy training and also had a IMDT behaviourist work with us. She's very intelligent and quick to learn.
One thing we had not been able to resolve is biting and jumping, mostly on walks (or in garden) where she suddenly gets the "zoomies" and frantically runs back and forth, jumping up and biting and growling at me/dh. It is very hard to calm her from this, impossible to simply turn away or distract. Because of the way she jumps and bites she has often broken the skin (through clothes) and left significant bruising. Tonight she did it on a family walk and went for ds (10). She has broken the skin on his shoulder.
We do a lot of sniffing work with her, "find it", as well as attention training, puzzles. We do raining before we go out for a walk, as advised by behaviourist, so her stimulation level is lower.
We thought we had cracked it and she was so much better. But she gets gunky ears, which vets are trying to treat and I do wonder if that is related.
Ds was understandably terrified, although later he told me he'd made up with dog and knows she doesn't mean it.
Her behaviour fits the criteria of overexcited or over stimulated. And I know we made some mistakes when she was small, which I tried to resolve (ds would let her bite him and play fight, but use cushions to shield- I repeatedly explains why he shouldn't and would stop) but this is likely linked.
I have been adament up to now that this is an issue with us, we need to train differently, look at ways to prevent. But tonight has made me wonder if this is the right approach. Should I be considering returning her? Is this something anyone else has managed to train out? The behaviourist was only able to say that we are doing the right things, just need consistency and time. I could not take dc on walks with her while this is worked on.
So please be gentle, I am genuinely asking for advice.
If you're worried about your pet's health, please speak to a vet or qualified professional.
The doghouse
Jumping and biting on walks- ddog bit dc
BreathlessCommotion · 21/07/2020 22:55
I have a golden retriever who still occasionally does this, he’s two now. Think it’s a Labrador / retriever type thing 
.
One thing that really worked for us at the worst stage was switching to a Halti head collar - it helped us regain control of him and I think sort of switched his mindset and he gradually stopped the silly attacking thing, even when running about off lead. Google Halti OP and you’ll find out more.
Oh, my dog was like this at that age. I totally relate to the despair. He was abominable . And I had done all the training to the letter, taken him to classes etc etc. We would be on a walk and suddenly he’d start biting the lead, rolling on his back, and I just couldn’t get through to him. He was not very food driven which was annoying as I could have turned into a fillet steak and he wouldn’t have cared.
At 13 months he was frogmarched in for the chop, which I had been delaying because of “professional” advice. He came out a changed dog! Instead of howling at the gates of likely female dogs and trying to escape, humping everything and everyone 
in sight, he was suddenly much more obedient and willing to learn (although still an accomplished thief...).
This link is meant to help, not confuse you further 
New Study into age for neutering and spaying dogs
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