[kittygilchrist]

Originally Posted by njbchbum

have a read of any article in this search list:

effect of dog urine on grass and plants - Bing

this article is a real brief summary:
Male Dog Urine Effects on Plants | eHow UK

many articles hilite the fact that female dog urine is most damaging because of the concentrated amount of urine released at one time as opposed to the marking habit of a male dog.

fwiw

thanks for those sites. I have a female dog and I get it why her urine is more caustic. She has been easy to train to go in pine straw, but your sites reinforce the OP's point that overdosing the mailbox plants with urine is harmful to shrubbery. Thanks, I didn't know that.