i brought 2 dogs that were about 12 months old ,they turned out to be the biggest load of rubish that i have ever owned ,i took them out 20 or more times and i tryed everthing with them ,the worst bit about it i was told that was doing there job ,they just would,nt run chase or they did was jog along ,i gave them away ,but ive also had dogs that would chase but not bite ,i had one who was 15 months old before he went into something but after he did ,he turned out to be a shit hot dog