You can't tell how old a terrier is.
Unless its really old then it might
have grayish fur around their muzzles.
~OJ~
they are black & white
To tell you the truth, not just terriers but all dogs, they really NEVER EVER stop playing until they absolutly CAN'T.
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Yorkshire terriers do bite when they are teething as puppy"s but when they are older and if your a good trainer to tell them not to then your yorkie will not bite.
Their heads never split.
fat n old
old age
Patterdale terriers, unfortunately, are not hypo-allergenic. However, many terriers are, including Scottish terriers, Welsh Terriers, Irish terriers, and Border Terriers.
Do you mean a Staffordshire Terrier mixed with a Boston Terrier?
about two to three months old, it varies.
It all depends on the training you give him, and socialisation.