The hair loss is usually symmetrical, and often most noticeable over the rump to start. The hair may lighten in color. The hair loss is often slow in onset. The skin itself may darken and thicken. Sometimes we will see skin and ear infections as secondary complications.
Staph infections are common.
Again, hypothyroid dogs are NOT itchy. Hypothyroidism may also lead to reproductive difficulty, although it does not always affect reproductive success. Bitches who repeatedly fail to catch should probably be checked, as treatment can lead to resolution of the problem. It is, however, also important to remember that hypothyroidism is considered to be a heritable condition, which should be factored into breeding decisions. Diagnosis of hypothyroidism is not difficult.