For speedy training, be vigilant and spot signs that your Chihuahua needs to go to the bathroom and is thinking about toileting in the house. Watch for behavior such as sidling up to furniture and sniffing, or sniffing the carpet and maneuvering as if to squat. When you see that behavior immediately scoop the dog up and pop it outside on to the toilet spot. It can help to keep the Chihuahua on a leash in the house, so that it can't wander off to a quiet corner and indulge itself in a spot of illicit peeing. When it's not possible to be with the dog, put it into its crate. However, you need to be sure to observe the 20 minute toilet break rule for pups and 1 hour for adults. If despite everything your Chihuahua toilets in the house, never tell him or her off. All this teaches the dog is that you have an irrational dislike of its bodily functions. This could make the dog more devious (it will hide to go to the bathroom) and actually sets potty training back because the dog may become fearful to toilet in front of you, even on the designated spot. Instead, bite your tongue and wait for the Chihuahua to wander off. Then clean up thoroughly using an enzymatic cleaner. The enzymatic cleaner gets rid of all traces of urine or poo so there is no scent mark for him or her to return to. Do not use household cleaners containing bleach or ammonia, since these are components of urine and can amplify the scent and draw the dog back to that spot. If Chi has already established an inappropriate place to toilet then clean it up with enzymatic cleaner and put its food and water bowls there. Dogs do not foul where they eat, so this will help to break that habit. Do not be violent or shout at your chihuahua. Instead, be loving and supportive. Your chihuahua will need time to get potty trained. Just continue to be consistent and don't get angry if your dog doesn't go to the bathroom on command right away. If the dog goes potty where it's supposed to, remember to reward it with treats. This will help to reinforce the desired behavior. Don't change the potty place every week or else the dog will be confused. If the puppy goes in the wrong place, be gentle, don't be angry because it happens. If potty training is not working and you have been at it for quite awhile, try contacting a trainer. Look for a training program that will work for both you and your dog. Getting professional help is the best option when in a position like this.
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One-sentence summary -- Keep an eye on Chihuahua in the house. Deal with accidents gracefully. Remember to be patient. Contact a trainer.

In this chapter, you can find 2,000 SP in a coffin near where you talk about Simmons and Ada. There are also 5,000 SP in a coffin near the spike trap. Kill the zombies you encounter for extra SP. When you fall into the next area after pulling the levers, let the game save, then quit the level and repeat as needed. For extra SP, try shooting the zombies in the head to make them Bloodshots, which are worth more. These chapters have lots of enemies that drop high amounts of SP. Each Ogroman enemy (the giant-like creatures with red organs on their backs) drops 4,000 SP. There are two Ogroman enemies in 2-3 avoid using the third AA gun to be able to get the SP from the second Ogroman. In 2-4, there are several Napad enemies (the ones with hard armor shells you need to break) worth 1,500 SP each and several Strelat enemies (the lizards that spit spines at you) worth 1,000 SP each. Try using the grenade launcher to kill all the Napads in the foyer to get about 10,000 in a very short time. In this chapter, you're in a race against Chris. If you're quick, you can rack up tons of SP in a short amount of time. Beating Chris to the elevator nets you 2,000 SP. After, when you're hacking the locks, use the shotgun to take down the drones effectively. If you do well, you'll beat Chris and win 14,000 SP. After the Simmons cutscene, the game will save and you can repeat this process for more SP. A good deal of SP is scattered through the entire chapter. Napads are worth 1,500 SP each, while Whoppers (the enormous fat zombies) are worth 2,500 each and Shriekers (the zombies with the large red growth on their chests) are worth 1,000 each. There are also lots of SP drops distributed in the various boxes, including a 4,000 SP drop in the treasure chest after the first Napad. Level 2-3 is especially lucrative killing the enemies in the underground lab can earn you about 25,000 SP in less than ten minutes. Jake has one of the easiest opportunities to farm SP in the entire game. The shopping district part of Chapter 4 has no enemies and two boxes containing a total of 7,000 SP. This section can be run through very quickly, so if you're willing to repeat it over and over again, you can earn tons of SP in a short time.
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One-sentence summary --
Try Helena's Chapter 3. Try Chris's chapters 2-3 and 2-4. Try Leon's Chapter 4. Try Ada's Chapter 2. Try running through Jake's Chapter 4 as quick as possible.