I'd recommend have a dog dna tested to see what breeds they might be. I got a rescue dog from a well known UK canine trust, they said the dog was a particular

I'd recommend have a dog dna tested to see what breeds they might be. I got a rescue dog from a well known UK canine trust, they said the dog was a particular middle class docile breed mix, prey drive was too strong based on my limited knowledge, dna test later, none of the breeds mentioned by the trust were there! Someone had been breeding something else, which explained the dog's prey drive. As a personal protection dog it would have fetched a very high amount considering its ability at seeing off a couple of loose German Shepherds and a couple of loose staffie's that wanted to attack him. If I wasn't allergic to dogs which I have also found out, I'd probably get another one, but with hindsight there is alot of things nobody really teaches you about dog ownership which might make people think twice about having one. They will take up a large part of your time which is something you may not want. Glycine can have anti anxiety effects and tastes much like sugar so may be useful for dogs displaying signs of anxiety.