treatment	individual	weight	length
dog	1	21	10
dog	1	22	10
dog	1	20	11
dog	1	23	10
dog	2	30	12
dog	2	31	13
dog	2	32	11
cat	3	10	5
cat	3	10	5
cat	3	11	4
cat	3	12	5
mouse	4	2	1
mouse	4	2	2
mouse	5	3	1
mouse	5	3	3
mouse	6	2.5	4
mouse	6	3	1
mouse	6	4	2
mouse	6	3.5	3
mouse	7	4	3
mouse	7	3	2