You could also just wait until the rat passes out for about 1 minute and them feed it - at this point, it could still have a bit of a heart beat and be slightly still alive.
1	You	you	PRON	PRP	Case=Nom|Person=2|PronType=Prs	5	nsubj	5:nsubj|17:nsubj	_
2	could	could	AUX	MD	VerbForm=Fin	5	aux	5:aux	_
3	also	also	ADV	RB	_	5	advmod	5:advmod	_
4	just	just	ADV	RB	_	5	advmod	5:advmod	_
5	wait	wait	VERB	VB	VerbForm=Inf	0	root	0:root	_
6	until	until	SCONJ	IN	_	9	mark	9:mark	_
7	the	the	DET	DT	Definite=Def|PronType=Art	8	det	8:det	_
8	rat	rat	NOUN	NN	Number=Sing	9	nsubj	9:nsubj	_
9	passes	pass	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	5	advcl	5:advcl:until	_
10	out	out	ADP	RP	_	9	compound:prt	9:compound:prt	_
11	for	for	ADP	IN	_	14	case	14:case	_
12	about	about	ADV	RB	_	13	advmod	13:advmod	_
13	1	1	NUM	CD	NumForm=Digit|NumType=Card	14	nummod	14:nummod	_
14	minute	minute	NOUN	NN	Number=Sing	9	obl	9:obl:for	_
15	and	and	CCONJ	CC	_	17	cc	17:cc	_
16	them	then	ADV	RB	Typo=Yes	17	advmod	17:advmod	CorrectForm=then
17	feed	feed	VERB	VBD	Mood=Ind|Number=Sing|Person=2|Tense=Past|VerbForm=Fin	5	conj	5:conj:and	_
18	it	it	PRON	PRP	Case=Acc|Gender=Neut|Number=Sing|Person=3|PronType=Prs	17	obj	17:obj	_
19	-	-	PUNCT	:	_	5	punct	5:punct	_
20	at	at	ADP	IN	_	22	case	22:case	_
21	this	this	DET	DT	Number=Sing|PronType=Dem	22	det	22:det	_
22	point	point	NOUN	NN	Number=Sing	27	obl	27:obl:at	SpaceAfter=No
23	,	,	PUNCT	,	_	27	punct	27:punct	_
24	it	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	27	nsubj	27:nsubj|38:nsubj	_
25	could	could	AUX	MD	VerbForm=Fin	27	aux	27:aux	_
26	still	still	ADV	RB	_	27	advmod	27:advmod	_
27	have	have	VERB	VB	VerbForm=Inf	5	parataxis	5:parataxis	_
28	a	a	DET	DT	Definite=Ind|PronType=Art	29	det	29:det	_
29	bit	bit	NOUN	NN	Number=Sing	27	obj	27:obj	_
30	of	of	ADP	IN	_	33	case	33:case	_
31	a	a	DET	DT	Definite=Ind|PronType=Art	33	det	33:det	_
32	heart	heart	NOUN	NN	Number=Sing	33	compound	33:compound	_
33	beat	beat	NOUN	NN	Number=Sing	29	nmod	29:nmod:of	_
34	and	and	CCONJ	CC	_	38	cc	38:cc	_
35	be	be	AUX	VB	VerbForm=Inf	38	cop	38:cop	_
36	slightly	slightly	ADV	RB	_	38	advmod	38:advmod	_
37	still	still	ADV	RB	_	38	advmod	38:advmod	_
38	alive	alive	ADJ	JJ	Degree=Pos	27	conj	27:conj:and	SpaceAfter=No
39	.	.	PUNCT	.	_	5	punct	5:punct	_
