The Guinea pig is better because its a lot larger than a hamster, rat, mouse, or degu.
1	The	the	DET	DT	Definite=Def|PronType=Art	3	det	3:det	_
2	Guinea	guinea	NOUN	NN	Number=Sing	3	compound	3:compound	_
3	pig	pig	NOUN	NN	Number=Sing	5	nsubj	5:nsubj	_
4	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	5	cop	5:cop	_
5	better	good	ADJ	JJR	Degree=Cmp	0	root	0:root	_
6	because	because	SCONJ	IN	_	11	mark	11:mark	_
7-8	its	_	_	_	_	_	_	_	_
7	it	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	11	nsubj	11:nsubj	_
8	s	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	11	cop	11:cop	_
9	a	a	DET	DT	Definite=Ind|PronType=Art	10	det	10:det	_
10	lot	lot	NOUN	NN	Number=Sing	11	obl:npmod	11:obl:npmod	_
11	larger	large	ADJ	JJR	Degree=Cmp	5	advcl	5:advcl:because	_
12	than	than	ADP	IN	_	14	case	14:case	_
13	a	a	DET	DT	Definite=Ind|PronType=Art	14	det	14:det	_
14	hamster	hamster	NOUN	NN	Number=Sing	11	obl	11:obl:than	SpaceAfter=No
15	,	,	PUNCT	,	_	16	punct	16:punct	_
16	rat	rat	NOUN	NN	Number=Sing	14	conj	11:obl:than|14:conj:or	SpaceAfter=No
17	,	,	PUNCT	,	_	18	punct	18:punct	_
18	mouse	mouse	NOUN	NN	Number=Sing	14	conj	11:obl:than|14:conj:or	SpaceAfter=No
19	,	,	PUNCT	,	_	21	punct	21:punct	_
20	or	or	CCONJ	CC	_	21	cc	21:cc	_
21	degu	degu	NOUN	NN	Number=Sing	14	conj	11:obl:than|14:conj:or	SpaceAfter=No
22	.	.	PUNCT	.	_	5	punct	5:punct	_
