Organisations without a BYOD policy have the benefit of selecting a small number of devices to support, while organisations with a BYOD policy could also limit the number of supported devices, but this could defeat the objective of allowing users the freedom to completely choose their device of preference.
Do you know that when talking about puppies, most trainers and behaviorists consider a puppy to be a dog that is just born to about 6 months of age? This may be a bit confusing because many of us have been told over the years that a dog is a puppy until about 1 year of age.
Many toy or small breeds may be considered adults at 9 months to 1 year of age. Giant breeds are often not considered adults until about 18 months of age. Some believe dogs are considered adult when they reach 80 to 90% of their adult weight. A couple articles that might be helpful to you are What to Expect from Your 12-month-old Puppy and What Your 12-month-old Puppy Needs. Best of luck!