Definition of lowâpressure. 1  1 : having, exerting, or operating under a relatively small pressure. 2  2 : easygoing.
Today some vets will spay/neuter at eight weeks of age, while other adhere to the old practice of six months of age. The average age at which pets are spayed or neutered is four months. Adolescent cats and dogs as young as five months can get pregnant.
Your Shih Tzu will have her first cycle when she is about 6 months old, this means that she can become pregnant at this age, although with proper breeding practices, she would not be bred so young. However, this is not written in stone. Some dogs enter as early as 4 months and some enter as late as 15 months. If your Shih Tzu dog is over 15 months and you have not noticed that she has entered into heat yet, this is a red flag signal to bring her to the vet as soon as possible.