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Dogs and All about Them
·
Robert Leighton
10
This
last
habit
of
the
domestic
dog
is
one
of
the
surviving
traits
of
his
wild
ancestry,
which,
like
his
habits
of
burying
bones
or
superfluous
food,
and
of
turning
round
and
round
on
a
carpet
as
if
to
make
a
nest
for
himself
before
lying
down,
go
far
towards
connecting
him
in
direct
relationship
with
the
wolf
and
the
jackal.
The
great
multitude
of
different
breeds
of
the
dog
and
the
vast
differences
in
their
size,
points,
and
general
appearance
are
facts
which
make
it
difficult
to
believe
that
they
could
have
had
a
common
ancestry.
One
thinks
of
the
difference
between
the
Mastiff
and
the
Japanese
Spaniel,
the
Deerhound
and
the
fashionable
Pomeranian,
the
St.
Bernard
and
the
Miniature
Black
and
Tan
Terrier,
and
is
perplexed
in
contemplating
the
possibility
of
their
having
descended
from
a
common
progenitor.
Yet
the
disparity
is
no
greater
than
that
between
the
Shire
horse
and
the
Shetland
pony,
the
Shorthorn
and
the
Kerry
cattle,
or
the
Patagonian
and
the
Pygmy;
and
all
dog
breeders
know
how
easy
it
is
to
produce
a
variety
in
type
and
size
by
studied
selection.
In
order
properly
to
understand
this
question
it
is
necessary
first
to
consider
the
identity
of
structure
in
the
wolf
and
the
dog.
This
identity
of
structure
may
best
be
studied
in
a
comparison
of
the
osseous
system,
or
skeletons,
of
the
two
animals,
which
so
closely
resemble
each
other
that
their
transposition
would
not
easily
be
detected.
The
spine
of
the
dog
consists
of
seven
vertebrae
in
the
neck,
thirteen
in
the
back,
seven
in
the
loins,
three
sacral
vertebrae,
and
twenty
to
twenty-two
in
the
tail.
In
both
the
dog
and
the
wolf
there
are
thirteen
pairs
of
ribs,
nine
true
and
four
false.
Each
has
forty-two
teeth.
They
both
have
five
front
and
four
hind
toes,
while
outwardly
the
common
wolf
has
so
much
the
appearance
of
a
large,
bare-boned
dog,
that
a
popular
description
of
the
one
would
serve
for
the
other.
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