Full text loading...
Canine hypothyroidism
/content/chapter/10.22233/9781910443866.chap18
Canine hypothyroidism
- Author: Carmel T. Mooney
- From: BSAVA Manual of Canine and Feline Endocrinology
- Item: Chapter 18, pp 128 - 150
- DOI: 10.22233/9781910443866.18
- Copyright: © 2023 British Small Animal Veterinary Association
- Publication Date: August 2023
Abstract
Hypothyroidism is considered a common endocrine disorder of dogs. Over the past few decades, significant advances have been made in recognizing the type of dog affected and the expected clinical and clinicopathological features, and in the performance and accuracy of endocrine tests for diagnosis. Despite this, hypothyroidism can be challenging to diagnose and many myths have persisted regarding its associations and consequences. On the other hand, if appropriately diagnosed, hypothyroidism is one of the most satisfying endocrine disorders to treat, with an excellent long-term prognosis.
Preview this chapter:
Canine hypothyroidism, Page 1 of 1
< Previous page | Next page > /docserver/preview/fulltext/10.22233/9781910443866/BSAVA_Manual_Canine_Feline_Endocrinology_5_9781910443866.18.128-150-1.gif
/content/chapter/10.22233/9781910443866.chap18
Figures
/content/figure/10.22233/9781910443866.chap18.fig18_1
18.1
Control of thyroid function. T3 = triiodothyronine; T4 = thyroxine; TRH = thyrotropin-releasing hormone; TSH = thyroid-stimulating hormone; 
= stimulation; 
= inhibition. © 2023 British Small Animal Veterinary Association
= stimulation; = inhibition. © 2023 British Small Animal Veterinary Association10.22233/9781910443866/fig18_1_thumb.gif
10.22233/9781910443866/fig18_1.png
18.1
Control of thyroid function. T3 = triiodothyronine; T4 = thyroxine; TRH = thyrotropin-releasing hormone; TSH = thyroid-stimulating hormone; 
= stimulation; 
= inhibition.
= stimulation; = inhibition.
/content/figure/10.22233/9781910443866.chap18.fig18_2
18.2
(a) Histological section of a healthy canine thyroid gland. (b) Histopathological section of a canine thyroid gland with lymphocytic thyroiditis. Note the inflammatory component replacing normal thyroid tissue. (c) Histopathological section of a canine thyroid gland with idiopathic thyroid atrophy. Note the loss of normal thyroid parenchyma without an inflammatory component. (Haematoxylin and eosin stain; original magnification X100) © 2023 British Small Animal Veterinary Association
10.22233/9781910443866/fig18_2_thumb.gif
10.22233/9781910443866/fig18_2.png
18.2
(a) Histological section of a healthy canine thyroid gland. (b) Histopathological section of a canine thyroid gland with lymphocytic thyroiditis. Note the inflammatory component replacing normal thyroid tissue. (c) Histopathological section of a canine thyroid gland with idiopathic thyroid atrophy. Note the loss of normal thyroid parenchyma without an inflammatory component. (Haematoxylin and eosin stain; original magnification X100)
/content/figure/10.22233/9781910443866.chap18.fig18_4
18.4
A 5-month-old male German Shepherd Dog with disproportionate dwarfism as a consequence of congenital hypothyroidism. Note the short legs, broad trunk and wide skull. © 2023 British Small Animal Veterinary Association
10.22233/9781910443866/fig18_4_thumb.gif
10.22233/9781910443866/fig18_4.png
18.4
A 5-month-old male German Shepherd Dog with disproportionate dwarfism as a consequence of congenital hypothyroidism. Note the short legs, broad trunk and wide skull.
/content/figure/10.22233/9781910443866.chap18.fig18_6
18.6
The hair loss of hypothyroidism typically begins in areas of friction such as (a) the neck in dogs that wear collars and (b) the tail (‘rat tail’). © 2023 British Small Animal Veterinary Association
10.22233/9781910443866/fig18_6_thumb.gif
10.22233/9781910443866/fig18_6.png
18.6
The hair loss of hypothyroidism typically begins in areas of friction such as (a) the neck in dogs that wear collars and (b) the tail (‘rat tail’).
/content/figure/10.22233/9781910443866.chap18.fig18_7
18.7
Truncal alopecia with hyperpigmentation in a hypothyroid dog. © 2023 British Small Animal Veterinary Association
10.22233/9781910443866/fig18_7_thumb.gif
10.22233/9781910443866/fig18_7.png
18.7
Truncal alopecia with hyperpigmentation in a hypothyroid dog.
/content/figure/10.22233/9781910443866.chap18.fig18_8
18.8
Nasal alopecia in a hypothyroid dog. © 2023 British Small Animal Veterinary Association
10.22233/9781910443866/fig18_8_thumb.gif
10.22233/9781910443866/fig18_8.png
18.8
Nasal alopecia in a hypothyroid dog.
/content/figure/10.22233/9781910443866.chap18.fig18_9
18.9
Tragic facial expression associated with hypothyroidism. © 2023 British Small Animal Veterinary Association
10.22233/9781910443866/fig18_9_thumb.gif
10.22233/9781910443866/fig18_9.png
18.9
Tragic facial expression associated with hypothyroidism.
/content/figure/10.22233/9781910443866.chap18.fig18_10
18.10
Excess wear of the middle digits in the forelimb of a dog with hypothyroidism, presumably as a consequence of a neuropathy or myopathy. © 2023 British Small Animal Veterinary Association
10.22233/9781910443866/fig18_10_thumb.gif
10.22233/9781910443866/fig18_10.png
18.10
Excess wear of the middle digits in the forelimb of a dog with hypothyroidism, presumably as a consequence of a neuropathy or myopathy.
/content/figure/10.22233/9781910443866.chap18.fig18_11
18.11
Corneal lipidosis associated with hypothyroidism. © 2023 British Small Animal Veterinary Association
10.22233/9781910443866/fig18_11_thumb.gif
10.22233/9781910443866/fig18_11.png
18.11
Corneal lipidosis associated with hypothyroidism.
/content/figure/10.22233/9781910443866.chap18.fig18_12
18.12
Diagnostic algorithm for hypothyroidism. cTSH = canine thyroid-stimulating hormone; NTI = non-thyroidal illness; T4 = thyroxine; TgAA = thyroglobulin autoantibody. © 2023 British Small Animal Veterinary Association
10.22233/9781910443866/fig18_12_thumb.gif
10.22233/9781910443866/fig18_12.png
18.12
Diagnostic algorithm for hypothyroidism. cTSH = canine thyroid-stimulating hormone; NTI = non-thyroidal illness; T4 = thyroxine; TgAA = thyroglobulin autoantibody.
/content/figure/10.22233/9781910443866.chap18.fig18_21
18.21
Lateral lumbar spinal radiograph in a dog with disproportionate dwarfism associated with congenital hypothyroidism. Note the shortened vertebral bodies with scalloped ventral borders. © 2023 British Small Animal Veterinary Association
10.22233/9781910443866/fig18_21_thumb.gif
10.22233/9781910443866/fig18_21.png
18.21
Lateral lumbar spinal radiograph in a dog with disproportionate dwarfism associated with congenital hypothyroidism. Note the shortened vertebral bodies with scalloped ventral borders.
/content/figure/10.22233/9781910443866.chap18.fig18_22
18.22
Cross-sectional ultrasonogram of the thyroid gland in a euthyroid dog. It is triangular in shape, homogeneous and hyperechoic compared with adjacent muscle. © 2023 British Small Animal Veterinary Association
10.22233/9781910443866/fig18_22_thumb.gif
10.22233/9781910443866/fig18_22.png
18.22
Cross-sectional ultrasonogram of the thyroid gland in a euthyroid dog. It is triangular in shape, homogeneous and hyperechoic compared with adjacent muscle.
/content/figure/10.22233/9781910443866.chap18.fig18_23
18.23
Thyroid scintigraphy images in (a) euthyroidism and (b) hypothyroidism. Thyroidal uptake measurements were 0.5% and 0.05% (reference interval 0.39–1.86%). Uptake is also noted in the salivary glands at the level of the ears. © 2023 British Small Animal Veterinary Association
10.22233/9781910443866/fig18_23_thumb.gif
10.22233/9781910443866/fig18_23.png
18.23
Thyroid scintigraphy images in (a) euthyroidism and (b) hypothyroidism. Thyroidal uptake measurements were 0.5% and 0.05% (reference interval 0.39–1.86%). Uptake is also noted in the salivary glands at the level of the ears.
/content/figure/10.22233/9781910443866.chap18.fig18_24
18.24
Schematic representation of the steps in a therapeutic trial for diagnosing hypothyroidism. cTSH = canine thyroid-stimulating hormone; T4 = thyroxine. © 2023 British Small Animal Veterinary Association
10.22233/9781910443866/fig18_24_thumb.gif
10.22233/9781910443866/fig18_24.png
18.24
Schematic representation of the steps in a therapeutic trial for diagnosing hypothyroidism. cTSH = canine thyroid-stimulating hormone; T4 = thyroxine.
/content/figure/10.22233/9781910443866.chap18.fig18_25
18.25
Appearance of a hypothyroid dog (a) before and (b) after thyroid hormone replacement therapy. © 2023 British Small Animal Veterinary Association
10.22233/9781910443866/fig18_25_thumb.gif
10.22233/9781910443866/fig18_25.png
18.25
Appearance of a hypothyroid dog (a) before and (b) after thyroid hormone replacement therapy.