Puppies are more expensive than dogs because they need a lot of shots at first. It depends on how old the pup is & what shots he’s had. If its a rescue, I’m assuming the spay/neuter is included & up to date on shots. About how old is the pup you’re looking into?
You’ll have the upfront costs (my dog “came with” a bed, bowls, leash, etc), but I won’t count all that since you won’t be buying this stuff montly (unless your pup destroys it by chewing)
I pay $45 month on food (its a high quality food & I recommend a grain-free diet)
Chews/bones $10 month (you’ll need extra chewing stuff in the puppy years, I’d say about double or triple, depending on the pup)
Toys $20 month (you’ll go through less as the pup gets older)
If your pup eats something toxic/harmful to him that could be a $1000 vet bill (or more or less)
Shots can range from (also depends on the vet) $10-35 around here plus the vet visit per shot, which here is $50, but some places charge more. At my vet, if the vet tech does the shot instead of the veterinarian, they waive the exam fee if they’ve been seen recently. So this will vary.
If you don’t keep up to date on his shots & he gets really sick, that can be a few thousand dollars if they have to do IV’s. The shots don’t “work” until they’ve had all of the series of that shot & you can’t miss one.
Dewormer (cheap, probably around $15 for 2 doses, but depends on weight). This isn’t monthly, but the first month you’ll want to do this. Even if the rescue wormed them I’d still talk to your vet about it.
If you want to use flea stuff, that’s probably around $20 for 3 months, depending on the medicine. I don’t use flea stuff so my pricing may be off. Flea stuff can cause bad reactions in dogs. I don’t recommend it unless you notice fleas. I don’t do anything flea-related to my dog & she hasn’t gotten fleas (had her for about 8 years).