Hi all, myself and my partner recently adopted a lovely 3 year old former coursing greyhound. He is gentle, fun, lazy - a typical greyhound. We were told by the rescue charity that he was great with other dogs and have picture based evidence of this - him lazing happily with both large and small dogs. to date however, his interactions with other dogs have been not great, to say the least. He barks in (what we assume to be) a playful manner at the dog next door over the fence. And when out on walks, he seems eager in a playful way to get to some large dogs and then ignores most others. however, when we tried to introduce him to my parents dog, a very energetic, yappy, bouncy, small shihtzu collie cross, he tried to bite her. Thankfully we had the muzzle on. We then went for a walk with the two dogs together and he was ok, but then began to whimper and bark in a scared way. This is upsetting for us as it is very important to us for a variety of reasons that he gets along with my parents dog. That was one of the first days we got him. Fast forward two weeks, we have kept walking him with the muzzle on (alone) and until last night when we went for a quick walk, muzzle off. Bad idea. A small, adorable, fat little Labrador puppy bounded towards him on the lead and our greyhound picked him up by the face and grabbed on. The screams from my partner, the puppy and the puppy’s owner were traumatising to listen to and will stay in my head. I got bitten in the process of separating the dogs. The puppy is fine, a cut to the face, and thankfully, the owners were a pleasure to deal with. But this could have been much, much much worse, from every perspective. The puppy could have been injured worse, as could I. The owners had every right to not be understanding also. im sorry for the long post but desperate for advice. I don’t understand how our dog could have been so great with dogs both big and small previously and is now aggressive. We are now strictly walking him on a muzzle only basis but now unsure how he will ever learn that small excited dogs are not prey if we constantly keep him away from them? it really is so important that he does eventually learn to tolerate, if not love, my parents dog. Would be so grateful for any advice.