He was trained to a harness/leash for outside time but he knew to use the litter pan inside.
1	He	he	PRON	PRP	Case=Nom|Gender=Masc|Number=Sing|Person=3|PronType=Prs	3	nsubj:pass	3:nsubj:pass	_
2	was	be	AUX	VBD	Mood=Ind|Number=Sing|Person=3|Tense=Past|VerbForm=Fin	3	aux:pass	3:aux:pass	_
3	trained	train	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	0	root	0:root	_
4	to	to	ADP	IN	_	6	case	6:case	_
5	a	a	DET	DT	Definite=Ind|PronType=Art	6	det	6:det	_
6	harness	harness	NOUN	NN	Number=Sing	3	obl	3:obl:to	SpaceAfter=No
7	/	/	SYM	,	_	8	cc	8:cc	SpaceAfter=No
8	leash	leash	NOUN	NN	Number=Sing	6	conj	3:obl:to|6:conj	_
9	for	for	ADP	IN	_	11	case	11:case	_
10	outside	outside	ADJ	JJ	Degree=Pos	11	amod	11:amod	_
11	time	time	NOUN	NN	Number=Sing	3	obl	3:obl:for	_
12	but	but	CCONJ	CC	_	14	cc	14:cc	_
13	he	he	PRON	PRP	Case=Nom|Gender=Masc|Number=Sing|Person=3|PronType=Prs	14	nsubj	14:nsubj|16:nsubj:xsubj	_
14	knew	know	VERB	VBD	Mood=Ind|Number=Sing|Person=3|Tense=Past|VerbForm=Fin	3	conj	3:conj:but	_
15	to	to	PART	TO	_	16	mark	16:mark	_
16	use	use	VERB	VB	VerbForm=Inf	14	xcomp	14:xcomp	_
17	the	the	DET	DT	Definite=Def|PronType=Art	19	det	19:det	_
18	litter	litter	NOUN	NN	Number=Sing	19	compound	19:compound	_
19	pan	pan	NOUN	NN	Number=Sing	16	obj	16:obj	_
20	inside	inside	ADV	RB	_	16	advmod	16:advmod	SpaceAfter=No
21	.	.	PUNCT	.	_	3	punct	3:punct	_
