### animal | dog:

Male dog
* Every male dog has the capacity to father hundreds of puppies.
* Many male dogs live together in complete harmony.
* Most male dogs raise legs.
* Most male dogs reach full maturity
  - sexual maturity
* Some male dogs use pheromone.
* are more aggressive and more likely to fight, especially with other male dogs
  - than female dogs
  - likely to bite than female dogs
  - sometimes equally anxious to mark their territories
* can be aggressive with other animals
  - make good children's pets if they are desexed
  - sense females in heat through pheromones
  - suffer from prostate problems, just like men do
* get interested in sex very early.
* have a bone in the end of the penis, with a groove in it
  - an increased incidence of osteosarcomas
* tend to urinate more frequently and therefore in smaller quantities.

Mastiff
* are dogs
  - gentle and intelligent guard dogs
  - prone to bloat, as well as hip and elbow dysplasia
* can be territorial dogs.
* come well above the waist of a medium-sized man and have large, powerful jaws.
* have a difficult time with change
  - huge heads and slobber a lot
  - massive bulk, powerful jaws and thick skin
* now have a DNA gene test.

### animal | dog | mastiff:

Tibetan mastiff
* Tibetan Mastiffs make excellent watchdogs and protectors, but tend to bark frequently.
* are large dogs with a lion-like appearance
  - quiet indoors and active outdoors

Mature dog
* Some mature dogs go through heat.
* have time.

Mutt
* are less prone to the genetic diseases that afflict many purebred dogs.
* have individuality.
* often make excellent kid dogs.

Obese dog
* are at greater risk than others.
* have heavy fat over the ribs, along the spine, and around the tail.

Old dog
* are difficult to place in homes.
* have new tricks
  - the same capabilities to learn, and can actually learn faster than puppies

### animal | dog:

Older dog
* Many older dogs are very healthy well into their teens
  - develop arthritis in their joints and spondyliti changes the spine
* Some older dogs can have behavior problems so engrained that they simply become management cases
  - develop a temporary head tilt from an unknown cause
* are also more prone to developing overuse injuries
  - just as capable of learning as younger dogs
  - more likely to have heart failure due to mitral valve insufficiency
  - usually more quiet than rowdy young dogs
* become more susceptible to such diseases of old age as tumors.
* can focus better because they're more mellow
  - get dental problems just like older people
  - sometimes benefit by repeated exposures to other dogs if introduced properly
* go through physical changes in their later years, just as people do.
* have their behaviour patterns established as well.
* make excellent pets for older individuals too
* tend to be calmer
  - settle in easily because they have learned how to get along with others

Outdoor dog
* are most susceptible to heartworm infection.
* burn extra energy to maintain their body heat in cold weather.
* do well twice a month, while indoor dogs can be safely bathed weekly.
* get to stay comfortable in outdoor pens with insulated shelters.
* live under yard rules.

Overweight dog
* are most susceptible due to the excess pressure created on the joints.
* can have health problems, just as humans can.
* have more health problems, including heart trouble and arthritis.

Pet dog
* Most pet dogs gain weight
  - live in homes
  - play roles
* Some pet dogs are killed by wolves.