I see tons of backyard bred
dogs here in AZ, tons of people who do not spay their pets, have no intention of breeding them and then complain that they mark territory and are
aggressive towards each other when they have two
intact males and one
intact female.
Now, there are a few notable exceptions to this rule — namely
intact males who consistently have trouble getting along with other males, and
female dogs who only show
aggressive behavior during their heat cycles.
For example,
intact males constitute 80 percent of all
dogs presented to veterinary behaviorists for what formerly has been described as dominance aggression, are involved in 70 to 76 percent of reported
dog bite incidents, and are 2.6 times more likely to bite than neutered
dogs, while unspayed
females «attract free - roaming males, which increases bite risk to people through increased exposure to unfamiliar
dogs,» and «contribute to the population of unwanted» and potentially
aggressive dogs (Gershman et al., 1993; Sacks et al., 2000; AVMA, 2001).