Steroids are a very large class of compounds which occur in all animals. The steroids used by us are mostly androgenic steroids: steroids which act like testosterone. The steroids used to treat inflammatory disorders (e.g. prednisolone, cortisone, beclome-thasone, budesonide, dexamethasone and dozens of others) are cortico-steroids and do not have anabolic effects.
                Testosterone in the male is produced mainly in the testis, a small amount being produced in the adrenal. It is synthesized from cholesterol. The regulation of its production may be simplified thus: the hypothalamus(part of the brain) produces gonadotrophin releasing hormone (GnRH) which acts on the anterior pituitary to increase the production of luteinizing hormone (LH) and follicle stimulating hormone (FSH). LH acts on the Leydig cells in the testis, causing them to produce testosterone. FSH, together with testosterone act on the Sertoli cells in the testis to regulate the production and maturation of spermatozoa. Testosterone in turn acts on the hypothalamus and anterior pituitary to suppress the production of GnRH, FSHand LH, producing a negative-feedback mechanism which keeps everything well-regulated. The small amount produced in the adrenal (in both sexes) is regulated by secretion of adrenal cortico-trophic hormone (ACTH), also secreted by the pituitary.
                   Testosterone, and its metabolites such as dihydro-testosterone, acts in many parts of the body, producing the secondary sexual characteristics of the male:  deep voice, greater muscle bulk, thicker skin, and genital maturity. At puberty it produces the growth spurt and the enlargement of the penis and testes as well as causing the fusion of the epiphyses (through its conversion to estrogen), bringing growth in height to an end. It plays some role in maintaining the sexual organs in the adult, but only a low concentration is required for this.
The normal production of testosterone in the adult male is excreted in the urine as 17-keto steroids, but a small amount is converted to estrogens.
                    Testosterone itself is given by injection. Oral preparations such as methyl-testosterone, fluoxymesterone, mesterolone, andstanolone are sometimes used, but they cause substantially more liver damage than injectable or rectally administered preparations. The oral preparations are absorbed from the gut and transported first to the liver (like most things taken by mouth), where they reach quite high concentrations and are extensively metabolized before circulating to the rest of the body.
                    Many other analogs have been developed with more anabolic effect than testosterone. These include such famous names as stanozolol, nandrolone, ethyloestrenol and oxymetholone. They all have substantially the same effects as testosterone: retention of sodium, potassium, water, calcium, sulfate, and phosphate, increased muscle synthesis in response to exercise and possible increases in aggression and or libido.
They act on the hypothalamus and pituitary to suppress the production of GnRH, FSH and LH, causing a virtual cessation in the production of natural testosterone in the testes and also reducing or stopping the production of spermatozoa. This effect does not always reverse when the artificial androgens are stopped.
A percentage of testosterone is converted to estrogen and some artificial androgens have some estrogen effect as well, causing enlargement of the breast tissue behind the nipple (gynaecomastia). This effect may be reduced by drugs which inhibit the binding of estrogen to its receptors: e.g. clomiphene, cyclofenil and tamoxifen or drugs that block the enzyme, aromatase, that converts testosterone to estrogen.
 

 In usual doses, steroids result in few side effects.
Androgenic steroids are effective in males with testicular failure and are occasionally used in osteoporosis and as an appetite stimulant. They were also used to treat anemia. In these cases the benefits clearly outweigh the risks for the patient.
Using drugs by a knowledge person doesn't make the drugs any safer, it just gives a greater chance that the adverse effects may be picked up sooner, and it decreases the chances that an abusive quantity will be used.

First, there are many different anabolic steroids and based on how the body handles them, they have very different side effects. Some steroids have virtually no side effects.
                In therapeutic doses, 50  mg deca-durabolin per week for example, very few side effects are observed.
                What happens when we give to our dogs some stronger anabolic steroids in abusive dosages? Numerous side effects can result while on steroids including increased sex drive, impotence, liver problems, aggression and dependence. Other side effects, including gynecomastia (bitch tits), high blood pressure, other cardiovascular diseases, stunted growth in pups, and enlargement of pre existing prostate tumors can persist even after steroid use has stopped. If we use steroids on bitches, in addition to the problems listed above, we can see virilizing (masculinizing) symptoms when using the harsher, androgenic compounds, including amenorrhea (which is reversible), deeper bark,
                Not all of these conditions are caused by all anabolic steroids. Some of the stronger anabolic steroids will only cause these problems for a certain percentage of the users, above certain dosages. Some of the milder anabolic steroids cause almost none of these side effects. That is way is a mistake to state that all steroid users will come down with these side effects. Most of the side effects of steroid use result from the conversion of testosterone to estrogen or dihydro-testosterone. Some anabolic steroids do not undergo this conversion. These steroids will have fewer side effects.
                Some asked if they should be concerned about side effects, when they give 50-100 mg/week of deca-durabolin. NO , because deca undergoes very little aromatization to estrogen, making the chances of side effects quite small, especially at such a low dose.
 
                A more valid question that is often asked is will 250 mg/week of testosterone make estrogen drugs necessary during a cycle to prevent gyno. Testosterone will convert to estrogen readily. However, gyno and many of the side effects of testosterone, don't show up at such low doses. In fact, testosterone has been shown to be relatively safe up to 200 mg/week for short duration use!
 

Many anabolic steroids have the potential to stunt the growth, so that is something every trainer or breeder should consider.
The cycle form depends always of the age of the dog , so if it is for a young male then cycles of deca and primo should be used and later we can use cycles of anavar and testosterone.
Once you have thought about all this and have extensive knowledge in this area then you can begin.

Administration without proper knowledge of steroids is rarely ever safe. You must be well educated in this area before you begin. Otherwise, it will be very easy to make mistakes.
Injectable steroids are far easier on the liver in general than oral preparations, because they absorbed directly in the blood stream and not metabolized first in the liver like the oral ones.
Some of the milder anabolic steroids include deca-durabolin(Decanofort), Naposim(primobolan) and oxandrolone. Some of the harsher anabolic steroids that result in more harmful effects include testosterone esters, stanozolol, anadrol and dianabol.  When considering dosage, whether it is deca or test, the most important consideration is the total mg/week.
Obviously, the higher the dosage, the greater is the risk for side effects.
What dosage a trainer chooses is completely up to him and the risk he is willing to take.
Many young males were trained with only 50-100mg/week and we could notice good gains. For older males we often got good gains between 150 and 200 mg/week. Unfortunately, harmful effects often show up when we gave 300 mg/week or more (this does not mean gyno will not show up at lower doses, just that it occurs with low frequency at lower doses).

Do not use steroids that aromatize or suppress endogenous testosterone for a taper. Any substance that suppresses endogenous test production will be very harsh for coming off cycle. Substances like deca-durabolin, equipoise, laurabolin, Naposim(primobolan) and proviron are commonly used for tapering. The two best compounds for tapering are probably are proviron and Naposim(primobolan).

When injecting steroids, whether water or oil based, they must be given deep intramuscularly and away from major nerves and blood vessels, i.e. the injection must penetrate the skin and surface fat and enter the muscle. The most common area to inject into is the back leg.
Some solutions can be harder to inject than others, causing the needle to block sometimes. Shake the solution vigorously before drawing into the syringe to avoid blocking.
The most acceptable needle is a 19 or 21 gauge (1.5 inch) with a 2.5ml syringe. Needles shorter than 1 inch are not recommended.
The injection site should be cleaned with an alcohol swab. Always use a new syringe and a new needle. To clear the syringe of air slowly squeeze the plunger, needle pointed up, until the air bubbles near the top are pushed out. Do not touch the needle. Once the syringe is inserted deep into the muscle, pull back on the plunger and make sure there is no blood in the syringe (indicating you've hit a blood vessel). Slowly inject the oil, withdraw the needle and press a new alcohol swab on the site. Rub the area vigorously. Always discard the used needle properly: use a needle disposal bin or coffee jar and return to a needle exchange.
It is not recommended to use the same injection site more than once a week.

These cycles usually lasts 6-8 weeks because the most muscle gain come in the first month of the cycle. The best cycles are those that last a short period of time.
Here is some examples off different types of cycles for dogs that weigh 30 Kg:

Diamond Pattern Cycle for a young male:
Week 1.  25 mg
Week 2.  50 mg
Week 3.  60 mg
Week 4.  75 mg
Week 5.  60 mg
Week 6.  50 mg
Week 7.  25 mg  + 35 mg (24 hours before the match)
 
The triangle Cycle for older males:
Week 1.  25 mg
Week 2.  50 mg
Week 3.  75 mg
Week 4.  75 mg
Week 5. 100 mg
Week 6. 100 mg
Week 7. 125 mg (half of it 24 hours before the match)

60 Linear Cycle (less days):
day   1. 50 mg
day 14. 50 mg
day 24. 50 mg
day 32. 50 mg
day 39. 50 mg
day 45. 50 mg
day 50. 50 mg
day 54. 50 mg
day 59. 50 mg
day 60 . match day

Cutting cycle
Week.       Decanofort   Naposin       Winstrol        HCG
       1        25 mg            10 mg
       2        25 mg            15 mg
       3        50 mg            15 mg
       4        50 mg            20 mg           1/3 cc
       5        75 mg            20 mg           1/3 cc
       6       100 mg           25 mg           1/3 cc
       7       100 mg           30 mg           1/2 cc
       8        75 mg            25 mg           1/2 cc (24 hours prior to the match).
 

Some steroid brands:
 
 

Decanofort (decadurabolin)
Nandrolone decanoate does not effect the immune system, unlike testosterone! It will not damage connective tissue, i.e. elbows, knees. It does not aromatize easily. Can help impotence! Gives the body a lean hard look. My favorite, it can be detected in the body a year after discontinued use. Nandrolone decanoate is one of the most popular steroids on the market. This steroid has very few side effects.
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Dose 25-150mg every 7 to 14 days

Testesterone esters (Testolent, Testosterone, Metiltestosterone)
Testosterone is dissolved in water and various esters which determines its life span in the body. Generally, Testosterone Suspension last one day in the body, Testosterone Phenilpropionate (Testolent) last 1-3 weeks. Testosterone Cypionate last 1-3 weeks and Testosterone Enanthate last from 2-4 weeks
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Dose: Testosterone Suspension ½ cc every other day, Propionate 25-50mg every 3 days, Cyponate 25-100mg/week.

Andriol  (Restandol,Undestor)
This is oral testosterone(testosterone undeconate)made by organon. It looks like beans and are brown with the inscription ORG on oneside and DV3 on the other. Organon claims this is a product with good effect and almost no side effects but andriol does not live up to that reputation. It is a weak steroid but it will work better if it is stacked with somthing else(Deca).
Dose is usually 4-10 tabs divided over the day. each tab contains 40mg of steroid.

Winstrol   (Winstol V,Winstol Depot)
Stanozolol is primarily used in humans as a cutting up drug by males and females. It's promotes protein anabolism and it's low on androgen. The injectable form of Winstrol (Winstrol V in the US & Winstrol Depot in Europe) is considered by athletes to be much safer than the oral form. Tabs are 2mg and the injectable form 50mg/cc, has to be taken 2-3 times a week.
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Dose is ½ cc-1cc/week(Winstrol V,D), 10-20mg/day(oral)

Naposim(primobolan)
This is a high anabolic low anadrogenic(almost none)steroid. Methenolone is a popular steroid for bitches because has low anadrogen properties. Naposim(primobolan) is often stacked with other steroids ex. Naposim(primobolan)+Deca+Sustenon in a bulk cycle and Naposim(primobolan)+Winstrol+Testosterone undecanate in a cutting cycle.
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Anadrol   (Hemogenin,Anapolon 50, Oxitosona 50)
This is a strong one! Oxymetholone is Probably the most anabolic on the market. This is a oral steroid which makes it so effective but also so toxic. Anadrol should be used with an anti estrogen like nolvadex or proviron. This drug is most commonly know for its ability of promoting a lean and hard look; unlike most steroids that aromatize easily and create a smooth bloated look, anavar will not. Anavar does not suppres testosterone production so its good for tapering and you will not have to use HCG or Clomid after a cycle. We usually use this drug in a cutting cycle
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Proviron
Masterolone is a anadrogenic steroid with almost no anabolic action. It is used as a anti estrogen and gives the body a hard dense look.
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Side effects:****

Nolvadex
Tamoxifen Citrate is used as an anti estrogen. It will stop the side effects of the steroids. Comes in 10mg tabs. Bad effect: Makes steroids work less! Only use it if you really need it.

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