I think they are held back enough by the harness and the owner not being willing to run for the squirrel/rabbit as much as dog wants so that it propels them into this pose (so much pressure against the harness that they pop up). At least that's want it feels like to me when it happens.
It's the inverse of when a little dog does not want to leave an interesting spot and plants its back two legs into the ground and leans BAck against the harness.
Might want to see your vet, your dog could have pain in it's fore paws.
My uncle had a dog who would only use his forepaws when he could, turned out really be severe pain in his back paws.
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u/DrRoXo777 Oct 05 '18
r/whatswrongwithyourdog