Table 5.

Proportional problem behaviours reported by owners by 21 months of age in a cohort of UK Pandemic Puppies acquired <16 weeks of age between 1 July and 31 December 2020. * A separation-related behaviour displayed only in the presence of the owner and not the absence. † New options resulting from analysis of free text to the response “Other”.

Owner-Reported Problem Behaviour (Number of Respondents Answering This Option, Either Yes or No)	Frequency
	n (Yes)	% (Yes)
Pulling on their lead (n = 892)	601	67.4
Jumping up at people (n = 890)	507	57.0
Not coming back when called (n = 898)	466	51.9
Chasing (e.g., cats, wildlife, traffic) (n = 897)	312	34.8
Barking or howling (n = 898)	293	32.6
Barking at other dogs (n = 899)	285	31.7
Clinginess (e.g., following you, sitting close) (n = 900)	271	30.1
Mouthing (n = 900)	262	29.1
Fear of loud noises (e.g., fireworks, thunderstorms) (n = 895)	189	21.1
Anxiety/fear around unfamiliar people (n = 901)	175	19.4
Mounting/humping other dogs, people, or objects (n = 900)	165	18.3
Anxiety/fear around other dogs (n = 902)	160	17.7
Eating their or other dogs’ faeces (n = 900)	149	16.6
Being destructive (n = 899)	130	14.5
Toileting (weeing or pooing) indoors (n = 898)	123	13.7
Guarding of food, toys, or other items (n = 902)	119	13.2
Aggression towards other dogs (n = 899)	103	11.5
* Destructive behaviour (e.g., chewing and causing damage to household items such as furniture, not including their own toys/treats) (n = 860)	73	8.5
Aggression towards unfamiliar people (n = 900)	57	6.3
† Frustration/overstimulation in certain situations (n = 738)	29	3.9
Aggression towards people in your household (including you) (n = 900)	33	3.7
Anxiety/fear around people in your household (including you) (n = 898)	28	3.1
† Anxiety/fear of unfamiliar situations (n = 738)	21	2.8
† Problems sleeping overnight (n = 738)	5	0.7