Table 3.

Prevalence of the most common disorders at a fine-level of diagnostic precision recorded in Chihuahuas (n = 5660) under primary veterinary care at UK practices participating in the VetCompass™ Programme from January 1st to December 31st, 2016. The P-value reflects prevalence comparison between females and males. *CI confidence interval

Fine-level disorder	Count	Overall prevalence %	95% CI*	Female prevalence %	Male prevalence %	P-Value	Median age (years)
Periodontal disease	762	13.5	12.6–14.4	13.3	13.7	0.650	5.2
Obesity	333	5.9	5.3–6.5	6.3	5.6	0.264	4.4
Retained deciduous dentition	324	5.7	5.1–6.4	5.4	6.1	0.269	1.6
Anal sac impaction	280	4.9	4.4–5.5	4.9	5.1	0.728	3.8
Aggression	238	4.2	3.7–4.8	3.5	4.9	0.008	3.5
Patellar luxation	224	4.0	3.5–4.5	4.2	3.7	0.345	2.9
Cryptorchidism (males only)	110	3.9	3.2–4.6	~	~	~	1.6
Overgrown nail(s)	187	3.3	2.9–3.8	3.6	3.1	0.279	3.7
Flea infestation	162	2.9	2.4–3.3	2.8	3.0	0.596	2.9
Heart murmur	115	2.0	1.7–2.4	1.3	2.8	<  0.001	8.9
Anal sac infection	100	1.8	1.4–2.1	1.4	2.1	0.053	4.1
Undesirable behaviour	83	1.5	1.2–1.8	1.4	1.6	0.485	2.5
Diarrhoea	76	1.3	1.1–1.7	1.1	1.5	0.189	2.2
Otitis externa	74	1.3	1.0–1.6	0.9	1.7	0.012	4.0
Lameness	63	1.1	0.9–1.4	1.0	1.2	0.571	2.5
Gastroenteritis	61	1.1	0.8–1.4	1.1	1.1	0.949	1.9
Vomiting	61	1.1	0.8–1.4	1.1	1.1	0.949	2.1
Dystocia (females only)	31	1.1	0.8–1.6	~	~	~	2.8
Pruritus	46	0.8	0.6–1.1	0.8	0.8	0.955	3.0
Corneal ulceration	46	0.8	0.6–1.1	0.9	0.7	0.516	3.4
Conjunctivitis	43	0.8	0.6–1.0	0.4	1.1	0.004	1.7
Claw injury	39	0.7	0.5–0.9	0.6	0.7	0.667	3.1
Infectious canine tracheobronchitis	36	0.6	0.4–0.9	0.5	0.8	0.105	2.1
Upper respiratory tract infection	36	0.6	0.4–0.9	0.4	0.9	0.009	3.2
Dental disease	35	0.6	0.4–0.9	0.6	0.6	0.904	4.2
Alopecia	33	0.6	0.4–0.9	0.5	0.6	0.634	1.5
Melaena	33	0.6	0.4–0.9	0.5	0.6	0.634	2.7
Spinal pain	31	0.6	0.4–0.8	0.4	0.7	0.115	5.5