If I had my way, try $750 a month on a horse! + $160 on lessons
But since I don't have a horse, My rabbit costs:
$45- innitial cost of buying
30- a year on rabbit shows
65- cage
40-toys, etc
5- supplies
15- show rabbit feed 25lbs. (lasts about 6 months)

Dog
$55 innitial cost of adopting
40- food per month
about 600 vet per year, he's pretty healthy
50- dog park registration
treats, toys- 30 per month
misc. medical and grooming supplies- 5 a month